diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 77979a7..618621b 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -3412,9 +3412,9 @@
 [[experiments]]
 === Section experiments
 
-This section covers experimental new features. Gerrit's frontend uses experiments
-to research new behavior. Once the research is done, the experimental feature
-either stays and the experimentation flag gets removed, or the feature as a whole
+This section covers experimental new features. Gerrit uses experiments
+to research new behavior in frontend and core backend. Once the research is done, the experimental
+feature either stays and the experimentation flag gets removed, or the feature as a whole
 gets removed
 
 [[experiments.enabled]]experiments.enabled::
diff --git a/Documentation/rest-api-changes.txt b/Documentation/rest-api-changes.txt
index 9876b53..096b068 100644
--- a/Documentation/rest-api-changes.txt
+++ b/Documentation/rest-api-changes.txt
@@ -14,10 +14,11 @@
 'POST /changes/'
 --
 
-The change input link:#change-input[ChangeInput] entity must be provided in the
-request body. It is not allowed to create changes on refs/tags/* or Gerrit
-internal refs such as refs/changes/*, refs/meta/external-ids/*, refs/users/*,
-etc.. and the request would fail with `400 Bad Request` in this case.
+The change input link:#change-input[ChangeInput] entity must be
+provided in the request body. It is not allowed to create changes
+under `refs/tags/` or Gerrit internal ref namespaces such as
+`refs/changes/`, `refs/meta/external-ids/`, and `refs/users/`. The
+request would fail with `400 Bad Request` in this case.
 
 To create a change the calling user must be allowed to
 link:access-control.html#category_push_review[upload to code review].
diff --git a/java/com/google/gerrit/acceptance/GerritServer.java b/java/com/google/gerrit/acceptance/GerritServer.java
index b02dc87..f2cc9d1 100644
--- a/java/com/google/gerrit/acceptance/GerritServer.java
+++ b/java/com/google/gerrit/acceptance/GerritServer.java
@@ -50,6 +50,7 @@
 import com.google.gerrit.server.config.GerritRuntime;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePath;
+import com.google.gerrit.server.experiments.ConfigExperimentFeatures;
 import com.google.gerrit.server.git.receive.AsyncReceiveCommits;
 import com.google.gerrit.server.schema.JdbcAccountPatchReviewStore;
 import com.google.gerrit.server.ssh.NoSshModule;
@@ -437,7 +438,8 @@
               protected void configure() {
                 bind(GerritRuntime.class).toInstance(GerritRuntime.DAEMON);
               }
-            }));
+            },
+            new ConfigExperimentFeatures.Module()));
     daemon.addAdditionalSysModuleForTesting(
         new ReindexProjectsAtStartup.Module(), new ReindexGroupsAtStartup.Module());
     daemon.start();
diff --git a/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java b/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
index 46dde41..8d52f5a 100644
--- a/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
+++ b/java/com/google/gerrit/httpd/raw/IndexHtmlUtil.java
@@ -20,7 +20,6 @@
 
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.ImmutableSet;
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.common.UsedAt;
@@ -31,6 +30,7 @@
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.json.OutputFormat;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
 import com.google.gson.Gson;
 import com.google.template.soy.data.SanitizedContent;
 import java.net.URI;
@@ -38,21 +38,15 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Function;
-import org.eclipse.jgit.lib.Config;
 
 /** Helper for generating parts of {@code index.html}. */
 @UsedAt(Project.GOOGLE)
 public class IndexHtmlUtil {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
 
-  static final ImmutableSet<String> DEFAULT_EXPERIMENTS =
-      ImmutableSet.of(
-          "UiFeature__patchset_comments", "UiFeature__patchset_choice_for_comment_links");
-
   private static final Gson GSON = OutputFormat.JSON_COMPACT.newGson();
   /**
    * Returns both static and dynamic parameters of {@code index.html}. The result is to be used when
@@ -60,7 +54,7 @@
    */
   public static ImmutableMap<String, Object> templateData(
       GerritApi gerritApi,
-      Config gerritServerConfig,
+      ExperimentFeatures experimentFeatures,
       String canonicalURL,
       String cdnPath,
       String faviconPath,
@@ -73,14 +67,8 @@
             staticTemplateData(
                 canonicalURL, cdnPath, faviconPath, urlParameterMap, urlInScriptTagOrdainer))
         .putAll(dynamicTemplateData(gerritApi, requestedURL));
+    Set<String> enabledExperiments = experimentFeatures.getEnabledExperimentFeatures();
 
-    Set<String> enabledExperiments = new HashSet<>();
-    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "enabled"))
-        .forEach(enabledExperiments::add);
-    DEFAULT_EXPERIMENTS.forEach(enabledExperiments::add);
-    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "disabled"))
-        .forEach(enabledExperiments::remove);
-    experimentData(urlParameterMap).forEach(enabledExperiments::add);
     if (!enabledExperiments.isEmpty()) {
       data.put("enabledExperiments", serializeObject(GSON, enabledExperiments).toString());
     }
diff --git a/java/com/google/gerrit/httpd/raw/IndexServlet.java b/java/com/google/gerrit/httpd/raw/IndexServlet.java
index b2bdf7c..3f2c202 100644
--- a/java/com/google/gerrit/httpd/raw/IndexServlet.java
+++ b/java/com/google/gerrit/httpd/raw/IndexServlet.java
@@ -22,6 +22,7 @@
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.extensions.api.GerritApi;
 import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
 import com.google.template.soy.SoyFileSet;
 import com.google.template.soy.data.SanitizedContent;
 import com.google.template.soy.data.UnsafeSanitizedContentOrdainer;
@@ -34,7 +35,6 @@
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import org.eclipse.jgit.lib.Config;
 
 public class IndexServlet extends HttpServlet {
   private static final long serialVersionUID = 1L;
@@ -43,7 +43,7 @@
   @Nullable private final String cdnPath;
   @Nullable private final String faviconPath;
   private final GerritApi gerritApi;
-  private final Config gerritServerConfig;
+  private final ExperimentFeatures experimentFeatures;
   private final SoySauce soySauce;
   private final Function<String, SanitizedContent> urlOrdainer;
 
@@ -52,12 +52,12 @@
       @Nullable String cdnPath,
       @Nullable String faviconPath,
       GerritApi gerritApi,
-      Config gerritServerConfig) {
+      ExperimentFeatures experimentFeatures) {
     this.canonicalUrl = canonicalUrl;
     this.cdnPath = cdnPath;
     this.faviconPath = faviconPath;
     this.gerritApi = gerritApi;
-    this.gerritServerConfig = gerritServerConfig;
+    this.experimentFeatures = experimentFeatures;
     this.soySauce =
         SoyFileSet.builder()
             .add(Resources.getResource("com/google/gerrit/httpd/raw/PolyGerritIndexHtml.soy"))
@@ -79,7 +79,7 @@
       ImmutableMap<String, Object> templateData =
           IndexHtmlUtil.templateData(
               gerritApi,
-              gerritServerConfig,
+              experimentFeatures,
               canonicalUrl,
               cdnPath,
               faviconPath,
diff --git a/java/com/google/gerrit/httpd/raw/StaticModule.java b/java/com/google/gerrit/httpd/raw/StaticModule.java
index 66e107b..cac716f 100644
--- a/java/com/google/gerrit/httpd/raw/StaticModule.java
+++ b/java/com/google/gerrit/httpd/raw/StaticModule.java
@@ -30,6 +30,7 @@
 import com.google.gerrit.server.config.GerritOptions;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
 import com.google.inject.Inject;
 import com.google.inject.Key;
 import com.google.inject.Provides;
@@ -221,11 +222,12 @@
     HttpServlet getPolyGerritUiIndexServlet(
         @CanonicalWebUrl @Nullable String canonicalUrl,
         @GerritServerConfig Config cfg,
-        GerritApi gerritApi) {
+        GerritApi gerritApi,
+        ExperimentFeatures experimentFeatures) {
       String cdnPath =
           options.useDevCdn() ? options.devCdn() : cfg.getString("gerrit", null, "cdnPath");
       String faviconPath = cfg.getString("gerrit", null, "faviconPath");
-      return new IndexServlet(canonicalUrl, cdnPath, faviconPath, gerritApi, cfg);
+      return new IndexServlet(canonicalUrl, cdnPath, faviconPath, gerritApi, experimentFeatures);
     }
 
     @Provides
diff --git a/java/com/google/gerrit/pgm/util/SiteProgram.java b/java/com/google/gerrit/pgm/util/SiteProgram.java
index 98558fb..c3be0a4 100644
--- a/java/com/google/gerrit/pgm/util/SiteProgram.java
+++ b/java/com/google/gerrit/pgm/util/SiteProgram.java
@@ -28,6 +28,7 @@
 import com.google.gerrit.server.config.GerritRuntime;
 import com.google.gerrit.server.config.GerritServerConfigModule;
 import com.google.gerrit.server.config.SitePath;
+import com.google.gerrit.server.experiments.ConfigExperimentFeatures;
 import com.google.gerrit.server.git.GitRepositoryManagerModule;
 import com.google.gerrit.server.git.SystemReaderInstaller;
 import com.google.gerrit.server.schema.SchemaModule;
@@ -128,6 +129,9 @@
 
     modules.add(new SchemaModule());
     modules.add(cfgInjector.getInstance(GitRepositoryManagerModule.class));
+    // The only implementation of experiments is available in all programs that can use
+    // gerrit.config
+    modules.add(new ConfigExperimentFeatures.Module());
 
     try {
       return Guice.createInjector(
diff --git a/java/com/google/gerrit/server/experiments/ConfigExperimentFeatures.java b/java/com/google/gerrit/server/experiments/ConfigExperimentFeatures.java
new file mode 100644
index 0000000..f526935
--- /dev/null
+++ b/java/com/google/gerrit/server/experiments/ConfigExperimentFeatures.java
@@ -0,0 +1,63 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.experiments;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.inject.AbstractModule;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+import org.eclipse.jgit.lib.Config;
+
+/**
+ * An implementation of {@link ExperimentFeatures} that uses gerrit.config to evaluate the status of
+ * the feature.
+ */
+@Singleton
+public class ConfigExperimentFeatures implements ExperimentFeatures {
+
+  public static class Module extends AbstractModule {
+    @Override
+    protected void configure() {
+      bind(ExperimentFeatures.class).to(ConfigExperimentFeatures.class);
+    }
+  }
+
+  private ImmutableSet<String> enabledExperimentFeatures;
+
+  @Inject
+  public ConfigExperimentFeatures(@GerritServerConfig Config gerritServerConfig) {
+    Set<String> enabledExperiments = new HashSet<>();
+    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "enabled"))
+        .forEach(enabledExperiments::add);
+    ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES.forEach(enabledExperiments::add);
+    Arrays.stream(gerritServerConfig.getStringList("experiments", null, "disabled"))
+        .forEach(enabledExperiments::remove);
+    enabledExperimentFeatures = ImmutableSet.copyOf(enabledExperiments);
+  }
+
+  @Override
+  public boolean isFeatureEnabled(String featureFlag) {
+    return getEnabledExperimentFeatures().contains(featureFlag);
+  }
+
+  @Override
+  public ImmutableSet<String> getEnabledExperimentFeatures() {
+    return enabledExperimentFeatures;
+  }
+}
diff --git a/java/com/google/gerrit/server/experiments/ExperimentFeatures.java b/java/com/google/gerrit/server/experiments/ExperimentFeatures.java
new file mode 100644
index 0000000..dc9148a
--- /dev/null
+++ b/java/com/google/gerrit/server/experiments/ExperimentFeatures.java
@@ -0,0 +1,44 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.experiments;
+
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Features that can be enabled/disabled on Gerrit (e. g. experiments to research new behavior in
+ * the current release).
+ *
+ * <p>It may depend on the implementation if the result is decided on the per-request basis or not,
+ * so the outcomes should not be persisted in {@link com.google.inject.Singleton}.
+ */
+public interface ExperimentFeatures {
+
+  /**
+   * Given the name of the feature, returns if it is enabled on the Gerrit server.
+   *
+   * <p>Depending on the implementation, it can be more efficient than filtering the results of
+   * {@link ExperimentFeatures#getEnabledExperimentFeatures}.
+   *
+   * @param featureFlag the name of the feature to test.
+   * @return if the feature is enabled.
+   */
+  boolean isFeatureEnabled(String featureFlag);
+
+  /**
+   * Returns the names of the features that are enabled on Gerrit instance (either by default or via
+   * gerrit.config).
+   */
+  ImmutableSet<String> getEnabledExperimentFeatures();
+}
diff --git a/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
new file mode 100644
index 0000000..af49438
--- /dev/null
+++ b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
@@ -0,0 +1,28 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.experiments;
+
+import com.google.common.collect.ImmutableSet;
+
+/** Constants for Gerrit {@link ExperimentFeatures} */
+public class ExperimentFeaturesConstants {
+
+  /** Features that are known experiments and can be referenced in the code. */
+  public static String UI_FEATURE_PATCHSET_COMMENTS = "UiFeature__patchset_comments";
+
+  /** Features, enabled by default in the current release. */
+  public static final ImmutableSet<String> DEFAULT_ENABLED_FEATURES =
+      ImmutableSet.of(UI_FEATURE_PATCHSET_COMMENTS);
+}
diff --git a/javatests/com/google/gerrit/acceptance/server/experiments/BUILD b/javatests/com/google/gerrit/acceptance/server/experiments/BUILD
new file mode 100644
index 0000000..0f01ffa
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/experiments/BUILD
@@ -0,0 +1,7 @@
+load("//javatests/com/google/gerrit/acceptance:tests.bzl", "acceptance_tests")
+
+acceptance_tests(
+    srcs = glob(["*IT.java"]),
+    group = "server_experiments",
+    labels = ["server"],
+)
diff --git a/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java b/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
new file mode 100644
index 0000000..09e6dfe
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/server/experiments/ExperimentFeaturesIT.java
@@ -0,0 +1,77 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.acceptance.server.experiments;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.gerrit.acceptance.AbstractDaemonTest;
+import com.google.gerrit.acceptance.config.GerritConfig;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
+import com.google.inject.Inject;
+import org.junit.Test;
+
+/** Tests for {@link ExperimentFeatures} */
+public class ExperimentFeaturesIT extends AbstractDaemonTest {
+
+  @Inject ExperimentFeatures experimentFeatures;
+
+  @Test
+  public void emptyConfig_defaultFeatures_enabled() {
+    for (String defaultFeature : ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES) {
+      assertThat(experimentFeatures.isFeatureEnabled(defaultFeature)).isTrue();
+    }
+
+    assertThat(experimentFeatures.getEnabledExperimentFeatures())
+        .isEqualTo(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES);
+  }
+
+  @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      values = {"enabledFeature", "enabledThenDisabledFeature"})
+  @GerritConfig(
+      name = "experiments.disabled",
+      values = {"enabledThenDisabledFeature"})
+  public void configOverride_anyFeatureAllowed() {
+    assertThat(experimentFeatures.isFeatureEnabled("enabledFeature")).isTrue();
+    assertThat(experimentFeatures.isFeatureEnabled("enabledThenDisabledFeature")).isFalse();
+    assertThat(experimentFeatures.isFeatureEnabled("unknownFeature")).isFalse();
+    ImmutableSet<String> expectedEnabledFeatures =
+        new ImmutableSet.Builder<String>()
+            .addAll(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES)
+            .add("enabledFeature")
+            .build();
+    assertThat(experimentFeatures.getEnabledExperimentFeatures())
+        .isEqualTo(expectedEnabledFeatures);
+  }
+
+  @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      values = {"enabledFeature"})
+  @GerritConfig(
+      name = "experiments.disabled",
+      values = {"UiFeature__patchset_comments"})
+  public void configOverride_defaultFeatureDisabled() {
+    assertThat(experimentFeatures.isFeatureEnabled("enabledFeature")).isTrue();
+    assertThat(
+            experimentFeatures.isFeatureEnabled(
+                ExperimentFeaturesConstants.UI_FEATURE_PATCHSET_COMMENTS))
+        .isFalse();
+    assertThat(experimentFeatures.getEnabledExperimentFeatures()).containsExactly("enabledFeature");
+  }
+}
diff --git a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
index ba9475f..634231f 100644
--- a/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
+++ b/javatests/com/google/gerrit/httpd/raw/IndexServletTest.java
@@ -15,19 +15,24 @@
 package com.google.gerrit.httpd.raw;
 
 import static com.google.common.truth.Truth.assertThat;
-import static java.util.stream.Collectors.joining;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
 import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.extensions.api.GerritApi;
 import com.google.gerrit.extensions.api.accounts.Accounts;
 import com.google.gerrit.extensions.api.config.Config;
 import com.google.gerrit.extensions.api.config.Server;
 import com.google.gerrit.extensions.common.ServerInfo;
 import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.server.experiments.ConfigExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
 import com.google.gerrit.util.http.testutil.FakeHttpServletRequest;
 import com.google.gerrit.util.http.testutil.FakeHttpServletResponse;
+import java.util.ArrayList;
+import java.util.List;
 import org.junit.Test;
 
 public class IndexServletTest {
@@ -55,14 +60,19 @@
     String testCdnPath = "bar-cdn";
     String testFaviconURL = "zaz-url";
 
-    String disabledDefault = IndexHtmlUtil.DEFAULT_EXPERIMENTS.asList().get(0);
+    // Pick any known experiment enabled by default;
+    String disabledDefault = ExperimentFeaturesConstants.UI_FEATURE_PATCHSET_COMMENTS;
+    assertThat(ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES).contains(disabledDefault);
+
     org.eclipse.jgit.lib.Config serverConfig = new org.eclipse.jgit.lib.Config();
     serverConfig.setStringList(
         "experiments", null, "enabled", ImmutableList.of("NewFeature", "DisabledFeature"));
     serverConfig.setStringList(
         "experiments", null, "disabled", ImmutableList.of("DisabledFeature", disabledDefault));
+    ExperimentFeatures experimentFeatures = new ConfigExperimentFeatures(serverConfig);
     IndexServlet servlet =
-        new IndexServlet(testCanonicalUrl, testCdnPath, testFaviconURL, gerritApi, serverConfig);
+        new IndexServlet(
+            testCanonicalUrl, testCdnPath, testFaviconURL, gerritApi, experimentFeatures);
 
     FakeHttpServletResponse response = new FakeHttpServletResponse();
 
@@ -85,14 +95,17 @@
                 + "\\x22\\/config\\/server\\/info\\x22: \\x7b\\x22default_theme\\x22:"
                 + "\\x22my-default-theme\\x22\\x7d, \\x22\\/config\\/server\\/top-menus\\x22: "
                 + "\\x5b\\x5d\\x7d');");
-    String enabledDefaults =
-        IndexHtmlUtil.DEFAULT_EXPERIMENTS.stream()
+    ImmutableSet<String> enabledDefaults =
+        ExperimentFeaturesConstants.DEFAULT_ENABLED_FEATURES.stream()
             .filter(e -> !e.equals(disabledDefault))
-            .collect(joining("\\x22,"));
+            .collect(ImmutableSet.toImmutableSet());
+    List<String> expectedEnabled = new ArrayList<>();
+    expectedEnabled.add("NewFeature");
+    expectedEnabled.addAll(enabledDefaults);
     assertThat(output)
         .contains(
-            "window.ENABLED_EXPERIMENTS = JSON.parse('\\x5b\\x22NewFeature\\x22,\\x22"
-                + enabledDefaults
+            "window.ENABLED_EXPERIMENTS = JSON.parse('\\x5b\\x22"
+                + String.join("\\x22,", expectedEnabled)
                 + "\\x22\\x5d');</script>");
   }
 }
diff --git a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
index 991a6cc..021d7c4 100644
--- a/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-summary/gr-change-summary.ts
@@ -79,8 +79,9 @@
           color: var(--chip-color);
           cursor: pointer;
           display: inline-block;
-          padding: var(--spacing-xxs) var(--spacing-s) var(--spacing-xxs)
+          padding: var(--spacing-xxs) var(--spacing-m) var(--spacing-xxs)
             var(--spacing-s);
+          margin-right: var(--spacing-s);
           border-radius: 12px;
           border: 1px solid gray;
           vertical-align: top;
@@ -410,15 +411,13 @@
                 !!countUnresolvedComments}
               >
                 No Comments</gr-summary-chip
-              >
-              <gr-summary-chip
+              ><gr-summary-chip
                 styleType=${SummaryChipStyles.WARNING}
                 icon="edit"
                 ?hidden=${!draftCount}
               >
                 ${pluralize(draftCount, 'draft')}</gr-summary-chip
-              >
-              <gr-summary-chip
+              ><gr-summary-chip
                 styleType=${SummaryChipStyles.WARNING}
                 icon="message"
                 ?hidden=${!countUnresolvedComments}
@@ -432,8 +431,7 @@
                     ></gr-avatar>`
                 )}
                 ${countUnresolvedComments} unresolved</gr-summary-chip
-              >
-              <gr-summary-chip
+              ><gr-summary-chip
                 styleType=${SummaryChipStyles.CHECK}
                 icon="markChatRead"
                 ?hidden=${!countResolvedComments}
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
index 95a6af9..36764f3 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
@@ -137,7 +137,7 @@
 };
 
 const ButtonTooltips = {
-  SAVE: 'Save but do not send notification or change review state',
+  SAVE: 'Send changes and comments as work in progress but do not start review',
   START_REVIEW: 'Mark as ready for review and send reply',
   SEND: 'Send reply',
   DISABLED_COMMENT_EDITING: 'Save draft comments to enable send',
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
index 1235512..79569bc 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog_html.ts
@@ -577,7 +577,7 @@
               has-tooltip=""
               title="[[_saveTooltip]]"
               on-click="_saveClickHandler"
-              >Save</gr-button
+              >Send As WIP</gr-button
             >
           </template>
           <gr-button
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
index cb64001..6ee82c9 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread.ts
@@ -326,6 +326,10 @@
     return this.restApiService.getLoggedIn();
   }
 
+  _getUnresolvedLabel(unresolved?: boolean) {
+    return unresolved ? 'Unresolved' : 'Resolved';
+  }
+
   @observe('comments.*')
   _commentsChanged() {
     this._orderedComments = sortComments(this.comments);
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
index ba541be..1a89a79 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_html.ts
@@ -132,7 +132,7 @@
       id="commentInfoContainer"
       hidden$="[[_hideActions(_showActions, _lastComment)]]"
     >
-      <span id="unresolvedLabel" hidden$="[[!unresolved]]">Unresolved</span>
+      <span id="unresolvedLabel">[[_getUnresolvedLabel(unresolved)]]</span>
       <div id="actions">
         <gr-button
           id="replyBtn"
diff --git a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
index e1c6bff..f2df89d 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment-thread/gr-comment-thread_test.ts
@@ -836,7 +836,7 @@
     element.unresolved = false;
     const label = element.shadowRoot?.querySelector('#unresolvedLabel');
     assert.isOk(label);
-    assert.isTrue(label!.hasAttribute('hidden'));
+    assert.isFalse(label!.hasAttribute('hidden'));
     element.unresolved = true;
     assert.isFalse(label!.hasAttribute('hidden'));
   });
diff --git a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
index 73dc2d2..374cc62 100644
--- a/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
+++ b/polygerrit-ui/app/elements/shared/gr-editable-content/gr-editable-content_html.ts
@@ -38,7 +38,7 @@
     }
     .editor.new-change-summary-true iron-autogrow-textarea,
     .viewer.new-change-summary-true {
-      min-height: 160px;
+      min-height: 100px;
     }
     .editor iron-autogrow-textarea {
       background-color: var(--view-background-color);
diff --git a/polygerrit-ui/app/services/flags/flags.ts b/polygerrit-ui/app/services/flags/flags.ts
index 891716b..f96afaa 100644
--- a/polygerrit-ui/app/services/flags/flags.ts
+++ b/polygerrit-ui/app/services/flags/flags.ts
@@ -30,4 +30,5 @@
   CI_REBOOT_CHECKS = 'UiFeature__ci_reboot_checks',
   NEW_CHANGE_SUMMARY_UI = 'UiFeature__new_change_summary_ui',
   PORTING_COMMENTS = 'UiFeature__porting_comments',
+  NEW_IMAGE_DIFF_UI = 'UiFeature__new_image_diff_ui',
 }