diff --git a/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js b/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js
index 73b8261..19d08ff 100644
--- a/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js
+++ b/polygerrit-ui/app/behaviors/gr-tooltip-behavior/gr-tooltip-behavior.js
@@ -49,6 +49,7 @@
       },
     },
 
+    /** @override */
     detached() {
       this._handleHideTooltip();
     },
diff --git a/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html b/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html
index d4e2c72..8a1ed87 100644
--- a/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html
+++ b/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html
@@ -540,6 +540,7 @@
         }
       },
 
+      /** @override */
       attached() {
         const shortcuts = shortcutManager.attachHost(this);
         if (!shortcuts) { return; }
@@ -559,6 +560,7 @@
         }
       },
 
+      /** @override */
       detached() {
         if (shortcutManager.detachHost(this)) {
           this.removeOwnKeyBindings();
diff --git a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.js b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.js
index 8c17c49..a421043 100644
--- a/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.js
+++ b/polygerrit-ui/app/elements/admin/gr-access-section/gr-access-section.js
@@ -40,6 +40,7 @@
   /**
    * @appliesMixin Gerrit.AccessMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrAccessSection extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -84,6 +85,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-saved',
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.js b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.js
index 5a62584..96008b7 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.js
+++ b/polygerrit-ui/app/elements/admin/gr-admin-group-list/gr-admin-group-list.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrAdminGroupList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -77,6 +78,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getCreateGroupCapability();
diff --git a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.js b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.js
index afc373d..e300c90 100644
--- a/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.js
+++ b/polygerrit-ui/app/elements/admin/gr-admin-view/gr-admin-view.js
@@ -23,6 +23,7 @@
    * @appliesMixin Gerrit.AdminNavMixin
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrAdminView extends Polymer.mixinBehaviors( [
     Gerrit.AdminNavBehavior,
@@ -82,6 +83,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.reload();
diff --git a/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.js b/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.js
index 7400d2a..3fde410 100644
--- a/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.js
+++ b/polygerrit-ui/app/elements/admin/gr-confirm-delete-item-dialog/gr-confirm-delete-item-dialog.js
@@ -25,6 +25,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmDeleteItemDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.js b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.js
index eb96794..3b85304 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-change-dialog/gr-create-change-dialog.js
@@ -24,6 +24,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreateChangeDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -64,6 +65,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (!this.repoName) { return Promise.resolve(); }
diff --git a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.js b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.js
index 4072986..8a4edab 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-group-dialog/gr-create-group-dialog.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreateGroupDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.js b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.js
index cf59af8..2d6b4aa 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-pointer-dialog/gr-create-pointer-dialog.js
@@ -25,6 +25,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreatePointerDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.js b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.js
index a6da3a1..290f025 100644
--- a/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.js
+++ b/polygerrit-ui/app/elements/admin/gr-create-repo-dialog/gr-create-repo-dialog.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCreateRepoDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.js b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.js
index 57b9689..11517d6 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.js
+++ b/polygerrit-ui/app/elements/admin/gr-group-audit-log/gr-group-audit-log.js
@@ -22,6 +22,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrGroupAuditLog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -42,11 +43,13 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.fire('title-change', {title: 'Audit Log'});
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._getAuditLogs();
diff --git a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.js b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.js
index f3a7ec7..8c29f73 100644
--- a/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.js
+++ b/polygerrit-ui/app/elements/admin/gr-group-members/gr-group-members.js
@@ -27,6 +27,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrGroupMembers extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -76,6 +77,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadGroupDetails();
diff --git a/polygerrit-ui/app/elements/admin/gr-group/gr-group.js b/polygerrit-ui/app/elements/admin/gr-group/gr-group.js
index 6597b4d..42846f4 100644
--- a/polygerrit-ui/app/elements/admin/gr-group/gr-group.js
+++ b/polygerrit-ui/app/elements/admin/gr-group/gr-group.js
@@ -32,6 +32,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrGroup extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -105,6 +106,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadGroup();
diff --git a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js
index 040eabf..e719154 100644
--- a/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js
+++ b/polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js
@@ -37,6 +37,7 @@
    * Fired when a permission that was previously added was removed.
    *
    * @event added-permission-removed
+   * @extends Polymer.Element
    */
   class GrPermission extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -94,12 +95,14 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-saved',
           () => this._handleAccessSaved());
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._setupValues();
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.js b/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.js
index c0ad9d42..92a8655 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.js
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-config-array-editor/gr-plugin-config-array-editor.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPluginConfigArrayEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.js b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.js
index 262f3d5..5dd6ec2 100644
--- a/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.js
+++ b/polygerrit-ui/app/elements/admin/gr-plugin-list/gr-plugin-list.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrPluginList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -74,6 +75,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.fire('title-change', {title: 'Plugins'});
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.js b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.js
index bffad1c..b350702 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-access/gr-repo-access.js
@@ -72,6 +72,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRepoAccess extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -128,6 +129,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-modified',
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-command/gr-repo-command.js b/polygerrit-ui/app/elements/admin/gr-repo-command/gr-repo-command.js
index 48e4c01..622bfe4 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-command/gr-repo-command.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-command/gr-repo-command.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrRepoCommand extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js
index 558f004..80b187a 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-commands/gr-repo-commands.js
@@ -28,6 +28,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRepoCommands extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -50,6 +51,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadRepo();
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.js b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.js
index 00611b6..8e09263 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-dashboards/gr-repo-dashboards.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRepoDashboards extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.js b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.js
index 109aa10..ccfdfc6 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-detail-list/gr-repo-detail-list.js
@@ -28,6 +28,7 @@
    * @appliesMixin Gerrit.ListViewMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRepoDetailList extends Polymer.mixinBehaviors( [
     Gerrit.ListViewBehavior,
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.js b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.js
index 3e706b5..c509717 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrRepoList extends Polymer.mixinBehaviors( [
     Gerrit.ListViewBehavior,
@@ -78,6 +79,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getCreateRepoCapability();
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.js b/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.js
index 404f93c..7368eb8 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-plugin-config/gr-repo-plugin-config.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.RepoPluginConfigMixin
+   * @extends Polymer.Element
    */
   class GrRepoPluginConfig extends Polymer.mixinBehaviors( [
     Gerrit.RepoPluginConfig,
diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.js b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.js
index a2097f9..f6328de 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.js
@@ -53,6 +53,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRepo extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -123,6 +124,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadRepo();
diff --git a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js
index 24e95b6..ac98d33 100644
--- a/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js
+++ b/polygerrit-ui/app/elements/admin/gr-rule-editor/gr-rule-editor.js
@@ -69,6 +69,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRuleEditor extends Polymer.mixinBehaviors( [
     Gerrit.AccessBehavior,
@@ -118,12 +119,14 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('access-saved',
           () => this._handleAccessSaved());
     }
 
+    /** @override */
     ready() {
       super.ready();
       // Called on ready rather than the observer because when new rules are
@@ -132,6 +135,7 @@
       this._setupValues(this.rule);
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (!this.rule) { return; } // Check needed for test purposes.
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
index 9ce5e46..013b44b 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
@@ -30,6 +30,7 @@
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.RESTClientMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrChangeListItem extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -74,6 +75,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       Gerrit.awaitPluginsLoaded().then(() => {
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
index 4e08b5c..e3a3b31 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.js
@@ -33,6 +33,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrChangeListView extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -133,6 +134,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('next-page',
@@ -141,6 +143,7 @@
           () => this._handlePreviousPage());
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadPreferences();
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
index 618b78f..2d6b440 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list/gr-change-list.js
@@ -29,6 +29,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.RESTClientMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrChangeList extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -135,17 +136,20 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('keydown',
           e => this._scopedKeydownHandler(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('tabindex', 0);
     }
 
+    /** @override */
     attached() {
       super.attached();
       Gerrit.awaitPluginsLoaded().then(() => {
diff --git a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js
index e6caacb..64d2486 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-change-help/gr-create-change-help.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrCreateChangeHelp extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js b/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js
index 303128b..7abd784 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-commands-dialog/gr-create-commands-dialog.js
@@ -23,6 +23,7 @@
     PUSH_PREFIX: 'git push origin HEAD:refs/for/',
   };
 
+  /** @extends Polymer.Element */
   class GrCreateCommandsDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js b/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js
index cbc7bcd..35f7450 100644
--- a/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js
+++ b/polygerrit-ui/app/elements/change-list/gr-create-destination-dialog/gr-create-destination-dialog.js
@@ -22,6 +22,7 @@
    * name and the branch name.
    *
    * @event confirm
+   * @extends Polymer.Element
    */
   class GrCreateDestinationDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
diff --git a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js
index 05f1abe..d0e1db2 100644
--- a/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js
+++ b/polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js
@@ -22,6 +22,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDashboardView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -94,6 +95,7 @@
       );
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadPreferences();
diff --git a/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js b/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js
index 96dcb98..de0a56e 100644
--- a/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js
+++ b/polygerrit-ui/app/elements/change-list/gr-embed-dashboard/gr-embed-dashboard.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEmbedDashboard extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js
index d4bd1df..c0e472a 100644
--- a/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js
+++ b/polygerrit-ui/app/elements/change-list/gr-repo-header/gr-repo-header.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrRepoHeader extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
index 40f0b73..2fc8170 100644
--- a/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
+++ b/polygerrit-ui/app/elements/change-list/gr-user-header/gr-user-header.js
@@ -17,6 +17,9 @@
 (function() {
   'use strict';
 
+  /**
+   * @extends Polymer.Element
+   */
   class GrUserHeader extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js
index 1034389..2c4ca82 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.js
@@ -196,6 +196,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeActions extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -432,6 +433,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('fullscreen-overlay-opened',
@@ -440,6 +442,7 @@
           () => this._handleShowBackgroundContent());
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.jsAPI.addElement(this.$.jsAPI.Element.CHANGE_ACTIONS, this);
diff --git a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js
index e13b462..3237d72 100644
--- a/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js
+++ b/polygerrit-ui/app/elements/change/gr-change-metadata/gr-change-metadata.js
@@ -50,6 +50,7 @@
 
   /**
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeMetadata extends Polymer.mixinBehaviors( [
     Gerrit.RESTClientBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.js b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.js
index 346fee3..a413c6f 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.js
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeRequirements extends Polymer.mixinBehaviors( [
     Gerrit.RESTClientBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js
index 4d2f1db..502cb27 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js
@@ -68,6 +68,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrChangeView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -324,6 +325,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
 
@@ -346,6 +348,7 @@
           () => this._handleReloadCommentThreads());
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getServerConfig().then(config => {
@@ -391,6 +394,7 @@
       this.listen(document, 'visibilitychange', '_handleVisibilityChange');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'scroll', '_handleScroll');
diff --git a/polygerrit-ui/app/elements/change/gr-comment-list/gr-comment-list.js b/polygerrit-ui/app/elements/change/gr-comment-list/gr-comment-list.js
index 3de51a7..58bdbbc 100644
--- a/polygerrit-ui/app/elements/change/gr-comment-list/gr-comment-list.js
+++ b/polygerrit-ui/app/elements/change/gr-comment-list/gr-comment-list.js
@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrCommentList extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.js b/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.js
index 2a3fe89..a339865 100644
--- a/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.js
+++ b/polygerrit-ui/app/elements/change/gr-commit-info/gr-commit-info.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrCommitInfo extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.js
index eb6f5f3..555c605 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-abandon-dialog/gr-confirm-abandon-dialog.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrConfirmAbandonDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog.js
index 0b3639f..35e9afb 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-conflict-dialog/gr-confirm-cherrypick-conflict-dialog.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmCherrypickConflictDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.js
index 6b01465..2b10a97 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-cherrypick-dialog/gr-confirm-cherrypick-dialog.js
@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmCherrypickDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.js
index d595f48..feb3d2f 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-move-dialog/gr-confirm-move-dialog.js
@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmMoveDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.js
index 7169437..607f587 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-rebase-dialog/gr-confirm-rebase-dialog.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrConfirmRebaseDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js
index 379226a..bf727ec 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js
@@ -22,6 +22,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmRevertDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog.js
index 51698be..d59f5cd 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-revert-submission-dialog/gr-confirm-revert-submission-dialog.js
@@ -23,6 +23,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmRevertSubmissionDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.js
index b4d3595..ea8bdb5 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-submit-dialog/gr-confirm-submit-dialog.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrConfirmSubmitDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog.js b/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog.js
index 72ad5d2..17c6f50 100644
--- a/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-download-dialog/gr-download-dialog.js
@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDownloadDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -54,6 +55,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'dialog');
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.js b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.js
index a611250..5828006 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.js
@@ -24,6 +24,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrFileListHeader extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js
index 90ab96c..0bc1a22 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.js
@@ -48,6 +48,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.PathListMixin
+   * @extends Polymer.Element
    */
   class GrFileList extends Polymer.mixinBehaviors( [
     Gerrit.AsyncForeachBehavior,
@@ -236,12 +237,14 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('keydown',
           e => this._scopedKeydownHandler(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       Gerrit.awaitPluginsLoaded().then(() => {
@@ -265,6 +268,7 @@
       });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this._cancelDiffs();
diff --git a/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.js b/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.js
index 134ce10..01c9b6e 100644
--- a/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-included-in-dialog/gr-included-in-dialog.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrIncludedInDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row.js b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row.js
index abfe469..1f9845e 100644
--- a/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row.js
+++ b/polygerrit-ui/app/elements/change/gr-label-score-row/gr-label-score-row.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLabelScoreRow extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.js b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.js
index ce2a3ef..0cbf2c7 100644
--- a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.js
+++ b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLabelScores extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message.js b/polygerrit-ui/app/elements/change/gr-message/gr-message.js
index 28348ba..59f12f5 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message.js
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message.js
@@ -22,6 +22,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrMessage extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -113,12 +114,14 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('click',
           e => this._handleClick(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.restAPI.getConfig().then(config => {
diff --git a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js
index 49ff60a..2c47dc1 100644
--- a/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js
+++ b/polygerrit-ui/app/elements/change/gr-messages-list/gr-messages-list.js
@@ -25,6 +25,7 @@
     SHOW_MORE: 'show-more-messages',
   };
 
+  /** @extends Polymer.Element */
   class GrMessagesList extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js
index c925142..d4a2398 100644
--- a/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js
+++ b/polygerrit-ui/app/elements/change/gr-related-changes-list/gr-related-changes-list.js
@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrRelatedChangesList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js
index 1828808..90f8540 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.js
@@ -58,6 +58,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrReplyDialog extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -249,6 +250,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getAccount().then(account => {
@@ -256,6 +258,7 @@
       });
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.jsAPI.addElement(this.$.jsAPI.Element.REPLY_DIALOG, this);
diff --git a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.js b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.js
index 7bef5dd..ddc6275 100644
--- a/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.js
+++ b/polygerrit-ui/app/elements/change/gr-reviewer-list/gr-reviewer-list.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrReviewerList extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.js b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.js
index de58d72..9e42de1 100644
--- a/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.js
+++ b/polygerrit-ui/app/elements/change/gr-thread-list/gr-thread-list.js
@@ -21,6 +21,7 @@
    * Fired when a comment is saved or deleted
    *
    * @event thread-list-modified
+   * @extends Polymer.Element
    */
   class GrThreadList extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
diff --git a/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.js b/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.js
index 0441129..60cbd42 100644
--- a/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-upload-help-dialog/gr-upload-help-dialog.js
@@ -29,6 +29,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrUploadHelpDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -65,6 +66,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.$.restAPI.getLoggedIn()
diff --git a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.js b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.js
index 1cbbf3e..66c00f9 100644
--- a/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.js
+++ b/polygerrit-ui/app/elements/core/gr-account-dropdown/gr-account-dropdown.js
@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.DisplayNameMixin
+   * @extends Polymer.Element
    */
   class GrAccountDropdown extends Polymer.mixinBehaviors( [
     Gerrit.DisplayNameBehavior,
@@ -50,6 +51,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._handleLocationChange();
@@ -66,6 +68,7 @@
       });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'location-change', '_handleLocationChange');
diff --git a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog.js b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog.js
index 2655140..db70d57 100644
--- a/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog.js
+++ b/polygerrit-ui/app/elements/core/gr-error-dialog/gr-error-dialog.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrErrorDialog extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.js b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.js
index 2a87708..9ef2461 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.js
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.js
@@ -28,6 +28,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrErrorManager extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -74,6 +75,7 @@
       this._authErrorHandlerDeregistrationHook;
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.listen(document, 'server-error', '_handleServerError');
@@ -89,6 +91,7 @@
           });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this._clearHideAlertHandle();
diff --git a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.js b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.js
index 2b86170..3d424bc 100644
--- a/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.js
+++ b/polygerrit-ui/app/elements/core/gr-key-binding-display/gr-key-binding-display.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrKeyBindingDisplay extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.js b/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.js
index 788c9e0..4630ca7 100644
--- a/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.js
+++ b/polygerrit-ui/app/elements/core/gr-keyboard-shortcuts-dialog/gr-keyboard-shortcuts-dialog.js
@@ -22,6 +22,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrKeyboardShortcutsDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -59,17 +60,20 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'dialog');
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.addKeyboardShortcutDirectoryListener(
           this._onDirectoryUpdated.bind(this));
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.removeKeyboardShortcutDirectoryListener(
diff --git a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js
index 07cac73..d5eeee8 100644
--- a/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js
+++ b/polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js
@@ -74,6 +74,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.DocsUrlMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrMainHeader extends Polymer.mixinBehaviors( [
     Gerrit.AdminNavBehavior,
@@ -150,11 +151,13 @@
       ];
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'banner');
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadAccount();
@@ -162,6 +165,7 @@
       this.listen(window, 'location-change', '_handleLocationChange');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'location-change', '_handleLocationChange');
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.js b/polygerrit-ui/app/elements/core/gr-router/gr-router.js
index 1dfa973..2bd403b 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.js
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.js
@@ -214,6 +214,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRouter extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js
index 956beea..335813a 100644
--- a/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js
+++ b/polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js
@@ -107,6 +107,7 @@
   /**
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrSearchBar extends Polymer.mixinBehaviors( [
     Gerrit.KeyboardShortcutBehavior,
diff --git a/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.js b/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.js
index 662e1b1..664d59f 100644
--- a/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.js
+++ b/polygerrit-ui/app/elements/core/gr-smart-search/gr-smart-search.js
@@ -23,6 +23,7 @@
 
   /**
    * @appliesMixin Gerrit.DisplayNameMixin
+   * @extends Polymer.Element
    */
   class GrSmartSearch extends Polymer.mixinBehaviors( [
     Gerrit.DisplayNameBehavior,
@@ -56,6 +57,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.$.restAPI.getConfig().then(cfg => {
diff --git a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.js b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.js
index f2b3d90..490367a 100644
--- a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.js
+++ b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.js
@@ -466,6 +466,7 @@
 
   /**
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrCommentApi extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,
@@ -480,6 +481,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('reload-drafts',
diff --git a/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer.js b/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer.js
index 201da05..1bc4674 100644
--- a/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer.js
+++ b/polygerrit-ui/app/elements/diff/gr-coverage-layer/gr-coverage-layer.js
@@ -24,6 +24,7 @@
     [Gerrit.CoverageType.NOT_INSTRUMENTED, 'Not instrumented by any tests.'],
   ]);
 
+  /** @extends Polymer.Element */
   class GrCoverageLayer extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.js b/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.js
index 591ebfe..05a7525 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-cursor/gr-diff-cursor.js
@@ -35,6 +35,7 @@
   const LEFT_SIDE_CLASS = 'target-side-left';
   const RIGHT_SIDE_CLASS = 'target-side-right';
 
+  /** @extends Polymer.Element */
   class GrDiffCursor extends Polymer.mixinBehaviors([Gerrit.FireBehavior],
       Polymer.GestureEventListeners(
           Polymer.LegacyElementMixin(Polymer.Element))) {
@@ -105,6 +106,7 @@
       ];
     }
 
+    /** @override */
     ready() {
       super.ready();
       Polymer.RenderStatus.afterNextRender(this, () => {
@@ -122,12 +124,14 @@
       });
     }
 
+    /** @override */
     attached() {
       super.attached();
       // Catch when users are scrolling as the view loads.
       this.listen(window, 'scroll', '_handleWindowScroll');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'scroll', '_handleWindowScroll');
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight.js b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight.js
index adb1be8..e524cd8 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrDiffHighlight extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -57,6 +58,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('comment-thread-mouseleave',
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js
index 300e72a..cb23308 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host.js
@@ -77,6 +77,8 @@
    *
    * Webcomponent fetching diffs and related data from restAPI and passing them
    * to the presentational gr-diff for rendering.
+   *
+   * @extends Polymer.Element
    */
   class GrDiffHost extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -249,6 +251,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener(
@@ -276,6 +279,7 @@
           event => this._handleDiffContextExpanded(event));
     }
 
+    /** @override */
     ready() {
       super.ready();
       if (this._canReload()) {
@@ -283,6 +287,7 @@
       }
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getLoggedIn().then(loggedIn => {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.js b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.js
index ae7ef6d..68bca23 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-mode-selector/gr-diff-mode-selector.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrDiffModeSelector extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog.js b/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog.js
index 7ed27dd..6aad66c 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-preferences-dialog/gr-diff-preferences-dialog.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrDiffPreferencesDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.js b/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.js
index bfccfe9..cdd0c7d 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-processor/gr-diff-processor.js
@@ -63,6 +63,8 @@
    *    "expand context" widget. This may require splitting a chunk/group so
    *    that the part that is within the context or has comments is shown, while
    *    the rest is not.
+   *
+   * @extends Polymer.Element
    */
   class GrDiffProcessor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
@@ -119,11 +121,13 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.listen(window, 'scroll', '_handleWindowScroll');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.cancel();
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection.js b/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection.js
index 37d54c9..359a039 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-selection/gr-diff-selection.js
@@ -32,6 +32,7 @@
 
   /**
    * @appliesMixin Gerrit.DomUtilMixin
+   * @extends Polymer.Element
    */
   class GrDiffSelection extends Polymer.mixinBehaviors( [
     Gerrit.DomUtilBehavior,
@@ -58,6 +59,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('copy',
@@ -66,6 +68,7 @@
           e => this._handleDown(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.classList.add(SelectionClass.RIGHT);
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js
index 3122370..5087d74 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.js
@@ -39,6 +39,7 @@
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDiffView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -244,6 +245,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getLoggedIn().then(loggedIn => {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
index 4b075e7..ef22188 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.js
@@ -94,6 +94,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrDiff extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -284,6 +285,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('create-range-comment',
@@ -292,11 +294,13 @@
           () => this._handleRenderContent());
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._observeNodes();
     }
 
+    /** @override */
     detached() {
       super.detached();
       this._unobserveIncrementalNodes();
diff --git a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.js b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.js
index 88c3a0e..d24e0bc 100644
--- a/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.js
+++ b/polygerrit-ui/app/elements/diff/gr-patch-range-select/gr-patch-range-select.js
@@ -30,6 +30,7 @@
    *
    * @property {string} patchNum
    * @property {string} basePatchNum
+   * @extends Polymer.Element
    */
   class GrPatchRangeSelect extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,
diff --git a/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer.js b/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer.js
index d9ad795..fd94b61 100644
--- a/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer.js
+++ b/polygerrit-ui/app/elements/diff/gr-ranged-comment-layer/gr-ranged-comment-layer.js
@@ -23,6 +23,7 @@
   const RANGE_HIGHLIGHT = 'style-scope gr-diff range';
   const HOVER_HIGHLIGHT = 'style-scope gr-diff rangeHighlight';
 
+  /** @extends Polymer.Element */
   class GrRangedCommentLayer extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.js b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.js
index 261cd4d..3d831c9 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.js
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrSelectionActionBox extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -42,6 +43,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
 
diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
index 9a15703..34bda26 100644
--- a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
@@ -131,6 +131,7 @@
   const GO_BACKSLASH_LITERAL = '\'\\\\\'';
   const GLOBAL_LT_PATTERN = /</g;
 
+  /** @extends Polymer.Element */
   class GrSyntaxLayer extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.js b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.js
index f317459..022a985 100644
--- a/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.js
+++ b/polygerrit-ui/app/elements/documentation/gr-documentation-search/gr-documentation-search.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.ListViewMixin
+   * @extends Polymer.Element
    */
   class GrDocumentationSearch extends Polymer.mixinBehaviors( [
     Gerrit.ListViewBehavior,
@@ -55,6 +56,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.dispatchEvent(
diff --git a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js
index ce9db61..73dbaf8 100644
--- a/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js
+++ b/polygerrit-ui/app/elements/edit/gr-default-editor/gr-default-editor.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrDefaultEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js
index 052c51c..e655f7b 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-controls/gr-edit-controls.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrEditControls extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,
diff --git a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js
index ddd2d29..d59fcf7 100644
--- a/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js
+++ b/polygerrit-ui/app/elements/edit/gr-edit-file-controls/gr-edit-file-controls.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEditFileControls extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
index aaafa46..12e16cf 100644
--- a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
+++ b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
@@ -29,6 +29,7 @@
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.PathListMixin
+   * @extends Polymer.Element
    */
   class GrEditorView extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -92,12 +93,14 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('content-change',
           e => this._handleContentChange(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getEditPrefs().then(prefs => { this._prefs = prefs; });
diff --git a/polygerrit-ui/app/elements/gr-app-element.js b/polygerrit-ui/app/elements/gr-app-element.js
index 14570f2..d39ba58 100644
--- a/polygerrit-ui/app/elements/gr-app-element.js
+++ b/polygerrit-ui/app/elements/gr-app-element.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrAppElement extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -114,6 +115,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this._bindKeyboardShortcuts();
@@ -127,6 +129,7 @@
           e => this._handleRpcLog(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this.$.reporting.appStarted();
diff --git a/polygerrit-ui/app/elements/gr-app.js b/polygerrit-ui/app/elements/gr-app.js
index 46a81ee..da54ac4 100644
--- a/polygerrit-ui/app/elements/gr-app.js
+++ b/polygerrit-ui/app/elements/gr-app.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrApp extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.js b/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.js
index 946147d..600421b 100644
--- a/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.js
+++ b/polygerrit-ui/app/elements/plugins/gr-dom-hooks/gr-dom-hooks.js
@@ -41,6 +41,7 @@
     return this._hooks[hookName];
   };
 
+  /** @constructor */
   function GrDomHook(hookName, opt_moduleName) {
     this._instances = [];
     this._callbacks = [];
diff --git a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.js b/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.js
index fcf4ce8..5a2f104 100644
--- a/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.js
+++ b/polygerrit-ui/app/elements/plugins/gr-endpoint-decorator/gr-endpoint-decorator.js
@@ -19,6 +19,7 @@
 
   const INIT_PROPERTIES_TIMEOUT_MS = 10000;
 
+  /** @extends Polymer.Element */
   class GrEndpointDecorator extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -46,6 +47,7 @@
       };
     }
 
+    /** @override */
     detached() {
       super.detached();
       for (const [el, domHook] of this._domHooks) {
@@ -145,6 +147,7 @@
       });
     }
 
+    /** @override */
     ready() {
       super.ready();
       Gerrit._endpoints.onNewEndpoint(this.name, this._initModule.bind(this));
diff --git a/polygerrit-ui/app/elements/plugins/gr-endpoint-param/gr-endpoint-param.js b/polygerrit-ui/app/elements/plugins/gr-endpoint-param/gr-endpoint-param.js
index 3010750..bcad7f9 100644
--- a/polygerrit-ui/app/elements/plugins/gr-endpoint-param/gr-endpoint-param.js
+++ b/polygerrit-ui/app/elements/plugins/gr-endpoint-param/gr-endpoint-param.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEndpointParam extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style.js b/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style.js
index aa9b13e..2e3bee1 100644
--- a/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style.js
+++ b/polygerrit-ui/app/elements/plugins/gr-external-style/gr-external-style.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrExternalStyle extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -73,11 +74,13 @@
       });
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._importAndApply();
     }
 
+    /** @override */
     ready() {
       super.ready();
       Gerrit.awaitPluginsLoaded().then(() => this._importAndApply());
diff --git a/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.js b/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.js
index cae3a91..da050fb 100644
--- a/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.js
+++ b/polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPluginHost extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup.js b/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup.js
index 412e788a..30bf6c8 100644
--- a/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup.js
+++ b/polygerrit-ui/app/elements/plugins/gr-popup-interface/gr-plugin-popup.js
@@ -17,6 +17,7 @@
 (function(window) {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPluginPopup extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api_test.html b/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api_test.html
index 9401a15..588facb 100644
--- a/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api_test.html
+++ b/polygerrit-ui/app/elements/plugins/gr-theme-api/gr-theme-api_test.html
@@ -65,6 +65,7 @@
       setup(() => {
         fixture('header-title');
         stub('gr-custom-plugin-header', {
+          /** @override */
           ready() { customHeader = this; },
         });
         Gerrit._loadPlugins([]);
diff --git a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.js b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.js
index 9b17fd7..7bf641d 100644
--- a/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.js
+++ b/polygerrit-ui/app/elements/settings/gr-account-info/gr-account-info.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrAccountInfo extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.js b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.js
index 2886c87..67dc0c4 100644
--- a/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.js
+++ b/polygerrit-ui/app/elements/settings/gr-agreements-list/gr-agreements-list.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
+   * @extends Polymer.Element
    */
   class GrAgreementsList extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -33,6 +34,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.loadData();
diff --git a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.js b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.js
index aa4e0c5..8521126 100644
--- a/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.js
+++ b/polygerrit-ui/app/elements/settings/gr-change-table-editor/gr-change-table-editor.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.ChangeTableMixin
+   * @extends Polymer.Element
    */
   class GrChangeTableEditor extends Polymer.mixinBehaviors( [
     Gerrit.ChangeTableBehavior,
diff --git a/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.js b/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.js
index e146a90..cff1d54 100644
--- a/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.js
+++ b/polygerrit-ui/app/elements/settings/gr-cla-view/gr-cla-view.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrClaView extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -45,6 +46,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.loadData();
diff --git a/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.js b/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.js
index 36e53b0..9523136 100644
--- a/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.js
+++ b/polygerrit-ui/app/elements/settings/gr-edit-preferences/gr-edit-preferences.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEditPreferences extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.js b/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.js
index 8ec1067..c60568c 100644
--- a/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.js
+++ b/polygerrit-ui/app/elements/settings/gr-email-editor/gr-email-editor.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrEmailEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.js b/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.js
index d45edff..9f04915 100644
--- a/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.js
+++ b/polygerrit-ui/app/elements/settings/gr-gpg-editor/gr-gpg-editor.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrGpgEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.js b/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.js
index 6c3a448..c7b5faa 100644
--- a/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.js
+++ b/polygerrit-ui/app/elements/settings/gr-group-list/gr-group-list.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrGroupList extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.js b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.js
index 5c0a059..efd0c39 100644
--- a/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.js
+++ b/polygerrit-ui/app/elements/settings/gr-http-password/gr-http-password.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrHttpPassword extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -30,6 +31,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.loadData();
diff --git a/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.js b/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.js
index 8b74130..ac4f9e4 100644
--- a/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.js
+++ b/polygerrit-ui/app/elements/settings/gr-identities/gr-identities.js
@@ -24,6 +24,7 @@
 
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
+   * @extends Polymer.Element
    */
   class GrIdentities extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.js b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.js
index 5b6c978..0ee232b 100644
--- a/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.js
+++ b/polygerrit-ui/app/elements/settings/gr-menu-editor/gr-menu-editor.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrMenuEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.js b/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.js
index 25499d6..4bb98d0 100644
--- a/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.js
+++ b/polygerrit-ui/app/elements/settings/gr-registration-dialog/gr-registration-dialog.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrRegistrationDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -67,6 +68,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'dialog');
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item.js
index 9702280..bae1f38 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-item.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrSettingsItem extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item.js
index e08e3d8..d5a7eb7 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-menu-item.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrSettingsMenuItem extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.js b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.js
index 0236261..78bad8c 100644
--- a/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.js
+++ b/polygerrit-ui/app/elements/settings/gr-settings-view/gr-settings-view.js
@@ -49,6 +49,7 @@
    * @appliesMixin Gerrit.DocsUrlMixin
    * @appliesMixin Gerrit.ChangeTableMixin
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrSettingsView extends Polymer.mixinBehaviors( [
     Gerrit.DocsUrlBehavior,
@@ -164,6 +165,7 @@
       ];
     }
 
+    /** @override */
     attached() {
       super.attached();
       // Polymer 2: anchor tag won't work on shadow DOM
@@ -231,6 +233,7 @@
       });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'location-change', '_handleLocationChange');
diff --git a/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.js b/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.js
index f8e5a5f..44fb48c 100644
--- a/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.js
+++ b/polygerrit-ui/app/elements/settings/gr-ssh-editor/gr-ssh-editor.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrSshEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.js b/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.js
index f638a07..df115ca 100644
--- a/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.js
+++ b/polygerrit-ui/app/elements/settings/gr-watched-projects-editor/gr-watched-projects-editor.js
@@ -25,6 +25,7 @@
     {name: 'Abandons', key: 'notify_abandoned_changes'},
   ];
 
+  /** @extends Polymer.Element */
   class GrWatchedProjectsEditor extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.js b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.js
index 2f9572c..8cd2021 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-chip/gr-account-chip.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrAccountChip extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -63,6 +64,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._getHasAvatars().then(hasAvatars => {
diff --git a/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.js b/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.js
index 0ed3f19..d2a111a 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-entry/gr-account-entry.js
@@ -20,6 +20,8 @@
   /**
    * gr-account-entry is an element for entering account
    * and/or group with autocomplete support.
+   *
+   * @extends Polymer.Element
    */
   class GrAccountEntry extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
diff --git a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.js b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.js
index 1c0cb65..34c4cb6 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-label/gr-account-label.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.DisplayNameMixin
    * @appliesMixin Gerrit.TooltipMixin
+   * @extends Polymer.Element
    */
   class GrAccountLabel extends Polymer.mixinBehaviors( [
     Gerrit.DisplayNameBehavior,
@@ -61,6 +62,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       if (!this.additionalText) { this.additionalText = ''; }
diff --git a/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.js b/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.js
index f23959a..b0ce04c 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-link/gr-account-link.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
+   * @extends Polymer.Element
    */
   class GrAccountLink extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.js b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.js
index 0a4100c..7955d50 100644
--- a/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.js
+++ b/polygerrit-ui/app/elements/shared/gr-account-list/gr-account-list.js
@@ -21,6 +21,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrAccountList extends Polymer.mixinBehaviors( [
     // Used in the tests for gr-account-list and other elements tests.
@@ -113,6 +114,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('remove',
diff --git a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.js b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.js
index 433a57b..215f469 100644
--- a/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.js
+++ b/polygerrit-ui/app/elements/shared/gr-alert/gr-alert.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrAlert extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -52,11 +53,13 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.addEventListener('transitionend', this._boundTransitionEndHandler);
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.removeEventListener('transitionend',
diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.js b/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.js
index f536666..5ca95e1 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.js
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete-dropdown/gr-autocomplete-dropdown.js
@@ -21,6 +21,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Polymer.IronFitMixin
+   * @extends Polymer.Element
    */
   class GrAutocompleteDropdown extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.js b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.js
index e2f42b3..60985c1 100644
--- a/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.js
+++ b/polygerrit-ui/app/elements/shared/gr-autocomplete/gr-autocomplete.js
@@ -23,6 +23,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrAutocomplete extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -192,11 +193,13 @@
       return this.$.input.$.nativeInput || this.$.input.inputElement;
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.listen(document.body, 'click', '_handleBodyClick');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(document.body, 'click', '_handleBodyClick');
diff --git a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.js b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.js
index 4238eed..efa97cf 100644
--- a/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.js
+++ b/polygerrit-ui/app/elements/shared/gr-avatar/gr-avatar.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
+   * @extends Polymer.Element
    */
   class GrAvatar extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -44,6 +45,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       Promise.all([
diff --git a/polygerrit-ui/app/elements/shared/gr-button/gr-button.js b/polygerrit-ui/app/elements/shared/gr-button/gr-button.js
index 75efcdc..abfbb18 100644
--- a/polygerrit-ui/app/elements/shared/gr-button/gr-button.js
+++ b/polygerrit-ui/app/elements/shared/gr-button/gr-button.js
@@ -20,6 +20,7 @@
   /**
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.TooltipMixin
+   * @extends Polymer.Element
    */
   class GrButton extends Polymer.mixinBehaviors( [
     Gerrit.KeyboardShortcutBehavior,
@@ -68,6 +69,7 @@
       ];
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('click',
@@ -76,6 +78,7 @@
           e => this._handleKeydown(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'button');
diff --git a/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.js b/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.js
index 05e759f..001632f 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.js
+++ b/polygerrit-ui/app/elements/shared/gr-change-star/gr-change-star.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrChangeStar extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.js b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.js
index 35b8ef8..7052a6a 100644
--- a/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.js
+++ b/polygerrit-ui/app/elements/shared/gr-change-status/gr-change-status.js
@@ -36,6 +36,7 @@
   const PRIVATE_TOOLTIP = 'This change is only visible to its owner and ' +
       'current reviewers (or anyone with "View Private Changes" permission).';
 
+  /** @extends Polymer.Element */
   class GrChangeStatus extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.js b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.js
index a1165ca..d8a56f8 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.js
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.js
@@ -24,6 +24,7 @@
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
    * @appliesMixin Gerrit.PathListMixin
+   * @extends Polymer.Element
    */
   class GrCommentThread extends Polymer.mixinBehaviors( [
     /**
@@ -157,12 +158,14 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('comment-update',
           e => this._handleCommentUpdate(e));
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getLoggedIn().then(loggedIn => {
diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.js b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.js
index 6449416..3f4cc69 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.js
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.js
@@ -34,6 +34,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrComment extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -186,6 +187,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (this.editing) {
@@ -198,6 +200,7 @@
       });
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.cancelDebouncer('fire-update');
diff --git a/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog.js b/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog.js
index 6a4232f..8d50fe0 100644
--- a/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog.js
+++ b/polygerrit-ui/app/elements/shared/gr-confirm-delete-comment-dialog/gr-confirm-delete-comment-dialog.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrConfirmDeleteCommentDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.js b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.js
index 6c062f6..2ce03e3 100644
--- a/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.js
+++ b/polygerrit-ui/app/elements/shared/gr-copy-clipboard/gr-copy-clipboard.js
@@ -19,6 +19,7 @@
 
   const COPY_TIMEOUT_MS = 1000;
 
+  /** @extends Polymer.Element */
   class GrCopyClipboard extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.js b/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.js
index 04724df..374204b 100644
--- a/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.js
+++ b/polygerrit-ui/app/elements/shared/gr-cursor-manager/gr-cursor-manager.js
@@ -22,6 +22,7 @@
     KEEP_VISIBLE: 'keep-visible',
   };
 
+  /** @extends Polymer.Element */
   class GrCursorManager extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -91,6 +92,7 @@
       };
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unsetCursor();
diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js
index 374844d..8c247e3 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js
@@ -33,6 +33,7 @@
 
   /**
    * @appliesMixin Gerrit.TooltipMixin
+   * @extends Polymer.Element
    */
   class GrDateFormatter extends Polymer.mixinBehaviors( [
     Gerrit.TooltipBehavior,
@@ -73,6 +74,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._loadPreferences();
diff --git a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.js b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.js
index d36aa37..8d00452 100644
--- a/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.js
+++ b/polygerrit-ui/app/elements/shared/gr-dialog/gr-dialog.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrDialog extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -60,6 +61,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('role', 'dialog');
diff --git a/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.js b/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.js
index 6e34bbc..c408e5a 100644
--- a/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.js
+++ b/polygerrit-ui/app/elements/shared/gr-diff-preferences/gr-diff-preferences.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrDiffPreferences extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.js b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.js
index 9e90ae3..17fafce 100644
--- a/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.js
+++ b/polygerrit-ui/app/elements/shared/gr-download-commands/gr-download-commands.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrDownloadCommands extends Polymer.mixinBehaviors( [
     Gerrit.RESTClientBehavior,
@@ -43,6 +44,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this._getLoggedIn().then(loggedIn => {
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.js b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.js
index 1fa0f1b..06b4a72 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.js
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown-list/gr-dropdown-list.js
@@ -45,6 +45,7 @@
    */
   Defs.item;
 
+  /** @extends Polymer.Element */
   class GrDropdownList extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.js b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.js
index 619005a..531f2e3 100644
--- a/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.js
+++ b/polygerrit-ui/app/elements/shared/gr-dropdown/gr-dropdown.js
@@ -23,6 +23,7 @@
   /**
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrDropdown extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.js b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.js
index 0c2d4f5..7d3308e 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.js
+++ b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content.js
@@ -22,6 +22,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrEditableContent extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.js b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.js
index 13000b4..ef5bb8c 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.js
+++ b/polygerrit-ui/app/elements/shared/gr-editable-label/gr-editable-label.js
@@ -23,6 +23,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrEditableLabel extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -76,6 +77,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._ensureAttribute('tabindex', '0');
diff --git a/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel.js b/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel.js
index 1e8f767..02e23e8 100644
--- a/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel.js
+++ b/polygerrit-ui/app/elements/shared/gr-fixed-panel/gr-fixed-panel.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrFixedPanel extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -61,6 +62,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (this.floatingDisabled) {
@@ -76,6 +78,7 @@
       this._observer.observe(this.$.header, {childList: true, subtree: true});
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'scroll', '_updateOnScroll');
diff --git a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.js b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.js
index 39b114d..7483590 100644
--- a/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.js
+++ b/polygerrit-ui/app/elements/shared/gr-formatted-text/gr-formatted-text.js
@@ -20,6 +20,7 @@
   // eslint-disable-next-line no-unused-vars
   const QUOTE_MARKER_PATTERN = /\n\s?>\s/g;
 
+  /** @extends Polymer.Element */
   class GrFormattedText extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -45,6 +46,7 @@
       ];
     }
 
+    /** @override */
     ready() {
       super.ready();
       if (this.noTrailingMargin) {
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.js b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.js
index 37972f9..ce34d3a 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.js
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard/gr-hovercard.js
@@ -25,6 +25,7 @@
    */
   const DIAGONAL_OVERFLOW = 15;
 
+  /** @extends Polymer.Element */
   class GrHovercard extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -91,6 +92,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (!this._target) { this._target = this.target; }
@@ -101,12 +103,14 @@
       this.listen(this._target, 'click', 'hide');
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('mouseleave',
           e => this.hide(e));
     }
 
+    /** @override */
     ready() {
       super.ready();
       // First, check to see if the container has already been created.
diff --git a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.js b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.js
index b1675cc..6f9268c 100644
--- a/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.js
+++ b/polygerrit-ui/app/elements/shared/gr-js-api-interface/gr-js-api-interface.js
@@ -39,6 +39,7 @@
 
   /**
    * @appliesMixin Gerrit.PatchSetMixin
+   * @extends Polymer.Element
    */
   class GrJsApiInterface extends Polymer.mixinBehaviors( [
     Gerrit.PatchSetBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.js b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.js
index 6e5fd5b..6e99e01 100644
--- a/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.js
+++ b/polygerrit-ui/app/elements/shared/gr-label-info/gr-label-info.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLabelInfo extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-label/gr-label.js b/polygerrit-ui/app/elements/shared/gr-label/gr-label.js
index 440e8e9..b594757 100644
--- a/polygerrit-ui/app/elements/shared/gr-label/gr-label.js
+++ b/polygerrit-ui/app/elements/shared/gr-label/gr-label.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.TooltipMixin
+   * @extends Polymer.Element
    */
   class GrLabel extends Polymer.mixinBehaviors( [
     Gerrit.TooltipBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete.js b/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete.js
index c02c598..cb5ad7c 100644
--- a/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete.js
+++ b/polygerrit-ui/app/elements/shared/gr-labeled-autocomplete/gr-labeled-autocomplete.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLabeledAutocomplete extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.js b/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.js
index 4c221bc..defc6bd 100644
--- a/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.js
+++ b/polygerrit-ui/app/elements/shared/gr-lib-loader/gr-lib-loader.js
@@ -20,6 +20,7 @@
   const HLJS_PATH = 'bower_components/highlightjs/highlight.min.js';
   const DARK_THEME_PATH = 'styles/themes/dark-theme.html';
 
+  /** @extends Polymer.Element */
   class GrLibLoader extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.js b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.js
index a57f331..ee032f6 100644
--- a/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.js
+++ b/polygerrit-ui/app/elements/shared/gr-limited-text/gr-limited-text.js
@@ -18,13 +18,13 @@
   'use strict';
 
   /**
-   * @appliesMixin Gerrit.TooltipMixin
-   */
-  /*
    * The gr-limited-text element is for displaying text with a maximum length
    * (in number of characters) to display. If the length of the text exceeds the
    * configured limit, then an ellipsis indicates that the text was truncated
    * and a tooltip containing the full text is enabled.
+   *
+   * @appliesMixin Gerrit.TooltipMixin
+   * @extends Polymer.Element
    */
   class GrLimitedText extends Polymer.mixinBehaviors( [
     Gerrit.TooltipBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.js b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.js
index bef9698..ccab685 100644
--- a/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.js
+++ b/polygerrit-ui/app/elements/shared/gr-linked-chip/gr-linked-chip.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrLinkedChip extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text.js b/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text.js
index 5d2a1ca..bbe525e 100644
--- a/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text.js
+++ b/polygerrit-ui/app/elements/shared/gr-linked-text/gr-linked-text.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrLinkedText extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.js b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.js
index dd825b3..8913cd8 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.js
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.js
@@ -23,6 +23,7 @@
    * @appliesMixin Gerrit.BaseUrlMixin
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrListView extends Polymer.mixinBehaviors( [
     Gerrit.BaseUrlBehavior,
@@ -48,6 +49,7 @@
       };
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.cancelDebouncer('reload');
diff --git a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.js b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.js
index fc9dc99..8821bcb 100644
--- a/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.js
+++ b/polygerrit-ui/app/elements/shared/gr-overlay/gr-overlay.js
@@ -23,6 +23,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrOverlay extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -52,6 +53,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('iron-overlay-closed',
diff --git a/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.js b/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.js
index 23389ee..ac876c4 100644
--- a/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.js
+++ b/polygerrit-ui/app/elements/shared/gr-page-nav/gr-page-nav.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrPageNav extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
@@ -28,11 +29,13 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       this.listen(window, 'scroll', '_handleBodyScroll');
     }
 
+    /** @override */
     detached() {
       super.detached();
       this.unlisten(window, 'scroll', '_handleBodyScroll');
diff --git a/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.js b/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.js
index ea39d0e..18e2596 100644
--- a/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.js
+++ b/polygerrit-ui/app/elements/shared/gr-repo-branch-picker/gr-repo-branch-picker.js
@@ -22,6 +22,7 @@
 
   /**
    * @appliesMixin Gerrit.URLEncodingMixin
+   * @extends Polymer.Element
    */
   class GrRepoBranchPicker extends Polymer.mixinBehaviors( [
     Gerrit.URLEncodingBehavior,
@@ -57,6 +58,7 @@
       };
     }
 
+    /** @override */
     attached() {
       super.attached();
       if (this.repo) {
@@ -64,6 +66,7 @@
       }
     }
 
+    /** @override */
     ready() {
       super.ready();
       this._branchDisabled = !this.repo;
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-auth.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-auth.js
index 0af1d97..1562e3e 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-auth.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-auth.js
@@ -76,7 +76,7 @@
     }
 
     /**
-     * @param {string} status
+     * @param {Auth.STATUS} status
      */
     _setStatus(status) {
       if (this._status === status) return;
@@ -252,6 +252,7 @@
     ACCESS_TOKEN: 'access_token',
   };
 
+  /** @enum {number} */
   Auth.STATUS = {
     UNDETERMINED: 0,
     AUTHED: 1,
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
index 0e2bef6..472a7ea 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
@@ -44,6 +44,7 @@
    * @appliesMixin Gerrit.PathListMixin
    * @appliesMixin Gerrit.PatchSetMixin
    * @appliesMixin Gerrit.RESTClientMixin
+   * @extends Polymer.Element
    */
   class GrRestApiInterface extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -105,6 +106,7 @@
       };
     }
 
+    /** @override */
     created() {
       super.created();
       this._auth = Gerrit.Auth;
diff --git a/polygerrit-ui/app/elements/shared/gr-select/gr-select.js b/polygerrit-ui/app/elements/shared/gr-select/gr-select.js
index c9f13de..ea838a0 100644
--- a/polygerrit-ui/app/elements/shared/gr-select/gr-select.js
+++ b/polygerrit-ui/app/elements/shared/gr-select/gr-select.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.FireMixin
+   * @extends Polymer.Element
    */
   class GrSelect extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -63,6 +64,7 @@
       this.nativeSelect.focus();
     }
 
+    /** @override */
     created() {
       super.created();
       this.addEventListener('change',
@@ -71,6 +73,7 @@
           () => this._updateValue());
     }
 
+    /** @override */
     ready() {
       super.ready();
       // If not set via the property, set bind-value to the element value.
diff --git a/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command.js b/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command.js
index 9456991..4b31086 100644
--- a/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command.js
+++ b/polygerrit-ui/app/elements/shared/gr-shell-command/gr-shell-command.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrShellCommand extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-storage/gr-storage.js b/polygerrit-ui/app/elements/shared/gr-storage/gr-storage.js
index 7950e51..53311b5 100644
--- a/polygerrit-ui/app/elements/shared/gr-storage/gr-storage.js
+++ b/polygerrit-ui/app/elements/shared/gr-storage/gr-storage.js
@@ -28,6 +28,7 @@
     'editablecontent:',
   ];
 
+  /** @extends Polymer.Element */
   class GrStorage extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.js b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.js
index d3119b7..a604bcf 100644
--- a/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.js
+++ b/polygerrit-ui/app/elements/shared/gr-textarea/gr-textarea.js
@@ -55,6 +55,7 @@
   /**
    * @appliesMixin Gerrit.FireMixin
    * @appliesMixin Gerrit.KeyboardShortcutMixin
+   * @extends Polymer.Element
    */
   class GrTextarea extends Polymer.mixinBehaviors( [
     Gerrit.FireBehavior,
@@ -125,6 +126,7 @@
       };
     }
 
+    /** @override */
     ready() {
       super.ready();
       if (this.monospace) {
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.js b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.js
index 22a5ecb..90e6a08 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.js
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content.js
@@ -19,6 +19,7 @@
 
   /**
    * @appliesMixin Gerrit.TooltipMixin
+   * @extends Polymer.Element
    */
   class GrTooltipContent extends Polymer.mixinBehaviors( [
     Gerrit.TooltipBehavior,
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip.js b/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip.js
index 170a442..6f458d1 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip.js
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip/gr-tooltip.js
@@ -17,6 +17,7 @@
 (function() {
   'use strict';
 
+  /** @extends Polymer.Element */
   class GrTooltip extends Polymer.GestureEventListeners(
       Polymer.LegacyElementMixin(
           Polymer.Element)) {
diff --git a/polygerrit-ui/app/samples/bind-parameters.html b/polygerrit-ui/app/samples/bind-parameters.html
index a28c462..e6bf9d1 100644
--- a/polygerrit-ui/app/samples/bind-parameters.html
+++ b/polygerrit-ui/app/samples/bind-parameters.html
@@ -22,6 +22,7 @@
           computed: '_computeExample(revision._number)',
         },
       },
+      /** @override */
       attached() {
         this.plugin.attributeHelper(this).bind(
             'revision', this._onRevisionChanged.bind(this));
diff --git a/polygerrit-ui/app/samples/repo-command.html b/polygerrit-ui/app/samples/repo-command.html
index afbc78c..5b3ee2c 100644
--- a/polygerrit-ui/app/samples/repo-command.html
+++ b/polygerrit-ui/app/samples/repo-command.html
@@ -31,6 +31,7 @@
     Polymer({
       is: 'repo-command-low',
 
+      /** @override */
       attached() {
         console.log(this.repoName);
         console.log(this.config);
diff --git a/polygerrit-ui/app/samples/some-screen.html b/polygerrit-ui/app/samples/some-screen.html
index da025a2..593b8ab 100644
--- a/polygerrit-ui/app/samples/some-screen.html
+++ b/polygerrit-ui/app/samples/some-screen.html
@@ -42,6 +42,7 @@
       properties: {
         rootUrl: String,
       },
+      /** @override */
       attached() {
         this.rootUrl = `${this.plugin.screenUrl()}`;
       },