diff --git a/lib/BUCK b/lib/BUCK
index 48e2ff4..7fa288d 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -13,6 +13,7 @@
 define_license(name = 'diffy')
 define_license(name = 'fetch')
 define_license(name = 'h2')
+define_license(name = 'highlightjs')
 define_license(name = 'jgit')
 define_license(name = 'jsch')
 define_license(name = 'MPL1.1')
diff --git a/lib/LICENSE-highlightjs b/lib/LICENSE-highlightjs
new file mode 100644
index 0000000..da266fa
--- /dev/null
+++ b/lib/LICENSE-highlightjs
@@ -0,0 +1,24 @@
+Copyright (c) 2006, Ivan Sagalaev
+All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of highlight.js nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/lib/highlightjs/BUCK b/lib/highlightjs/BUCK
new file mode 100644
index 0000000..9940136
--- /dev/null
+++ b/lib/highlightjs/BUCK
@@ -0,0 +1,5 @@
+export_file(
+  name = 'highlightjs',
+  src = 'highlight.min.js',
+  visibility = ['PUBLIC'],
+)
diff --git a/lib/highlightjs/building.md b/lib/highlightjs/building.md
new file mode 100644
index 0000000..315c381
--- /dev/null
+++ b/lib/highlightjs/building.md
@@ -0,0 +1,45 @@
+# Building Highlight.js for Gerrit
+
+Highlight JS needs to be built with specific language support. Here are the
+steps to build the minified file that appears here.
+
+NOTE: If you are adding support for a language to Highlight.js make sure to add
+it to the list of languages in the build command below.
+
+## Prerequisites
+
+You will need:
+
+* nodejs
+* closure-compiler
+* git
+
+## Steps to Create the Pack File
+
+The packed version of Highlight.js is an un-minified JS file with all of the
+languages included. Build it with the following:
+
+    $>  # start in some temp directory
+    $>  git clone https://github.com/isagalaev/highlight.js.git
+    $>  cd highlight.js
+    $>  node tools/build.js -n json css xml html javascript cpp go haskell \
+            markdown perl python bash sql scala prolog java objectivec
+
+The resulting JS file will appear in the "build" directory of the Highlight.js
+repo under the name "highlight.pack.js".
+
+## Minification
+
+Minify the file using closure-compiler using the command below. (Modify
+`/path/to` with the path to your compiler jar.)
+
+    $>  java -jar /path/to/closure-compiler.jar \
+            --js build/highlight.pack.js \
+            --js_output_file build/highlight.min.js
+
+Copy the header comment that appears on the first line of
+build/highlight.pack.js and add it to the start of build/highlight.min.js.
+
+## Finish
+
+Copy the resulting build/highlight.min.js file to lib/highlightjs
diff --git a/lib/highlightjs/highlight.min.js b/lib/highlightjs/highlight.min.js
new file mode 100644
index 0000000..b10ab89
--- /dev/null
+++ b/lib/highlightjs/highlight.min.js
@@ -0,0 +1,64 @@
+/*! highlight.js v9.5.0 | BSD3 License | git.io/hljslicense */
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enable_all enclosed encode encoding encrypt end end-exec endian enforced engine engines enqueue enterprise entityescaping eomonth error errors escaped evalname evaluate event eventdata events except exception exceptions exchange exclude excluding execu execut execute exempt exists exit exp expire explain export export_set extended extent external external_1 external_2 externally extract failed failed_login_attempts failover failure far fast feature_set feature_value fetch field fields file file_name_convert filesystem_like_logging final finish first first_value fixed flash_cache flashback floor flush following follows for forall force form forma format found found_rows freelist freelists freepools fresh from from_base64 from_days ftp full function general generated get get_format get_lock getdate getutcdate global global_name globally go goto grant grants greatest group group_concat group_id grouping grouping_id groups gtid_subtract guarantee guard handler hash hashkeys having hea head headi headin heading heap help hex hierarchy high high_priority hosts hour http id ident_current ident_incr ident_seed identified identity idle_time if ifnull ignore iif ilike ilm immediate import in include including increment index indexes indexing indextype indicator indices inet6_aton inet6_ntoa inet_aton inet_ntoa infile initial initialized initially initrans inmemory inner innodb input insert install instance instantiable instr interface interleaved intersect into invalidate invisible is is_free_lock is_ipv4 is_ipv4_compat is_not is_not_null is_used_lock isdate isnull isolation iterate java join json json_exists keep keep_duplicates key keys kill language large last last_day last_insert_id last_value lax lcase lead leading least leaves left len lenght length less level levels library like like2 like4 likec limit lines link list listagg little ln load load_file lob lobs local localtime localtimestamp locate locator lock locked log log10 log2 logfile logfiles logging logical logical_reads_per_call logoff logon logs long loop low low_priority lower lpad lrtrim ltrim main make_set makedate maketime managed management manual map mapping mask master master_pos_wait match matched materialized max maxextents maximize maxinstances maxlen maxlogfiles maxloghistory maxlogmembers maxsize maxtrans md5 measures median medium member memcompress memory merge microsecond mid migration min minextents minimum mining minus minute minvalue missing mod mode model modification modify module monitoring month months mount move movement multiset mutex name name_const names nan national native natural nav nchar nclob nested never new newline next nextval no no_write_to_binlog noarchivelog noaudit nobadfile nocheck nocompress nocopy nocycle nodelay nodiscardfile noentityescaping noguarantee nokeep nologfile nomapping nomaxvalue nominimize nominvalue nomonitoring none noneditionable nonschema noorder nopr nopro noprom nopromp noprompt norely noresetlogs noreverse normal norowdependencies noschemacheck noswitch not nothing notice notrim novalidate now nowait nth_value nullif nulls num numb numbe nvarchar nvarchar2 object ocicoll ocidate ocidatetime ociduration ociinterval ociloblocator ocinumber ociref ocirefcursor ocirowid ocistring ocitype oct octet_length of off offline offset oid oidindex old on online only opaque open operations operator optimal optimize option optionally or oracle oracle_date oradata ord ordaudio orddicom orddoc order ordimage ordinality ordvideo organization orlany orlvary out outer outfile outline output over overflow overriding package pad parallel parallel_enable parameters parent parse partial partition partitions pascal passing password password_grace_time password_lock_time password_reuse_max password_reuse_time password_verify_function patch path patindex pctincrease pctthreshold pctused pctversion percent percent_rank percentile_cont percentile_disc performance period period_add period_diff permanent physical pi pipe pipelined pivot pluggable plugin policy position post_transaction pow power pragma prebuilt precedes preceding precision prediction prediction_cost prediction_details prediction_probability prediction_set prepare present preserve prior priority private private_sga privileges procedural procedure procedure_analyze processlist profiles project prompt protection public publishingservername purge quarter query quick quiesce quota quotename radians raise rand range rank raw read reads readsize rebuild record records recover recovery recursive recycle redo reduced ref reference referenced references referencing refresh regexp_like register regr_avgx regr_avgy regr_count regr_intercept regr_r2 regr_slope regr_sxx regr_sxy reject rekey relational relative relaylog release release_lock relies_on relocate rely rem remainder rename repair repeat replace replicate replication required reset resetlogs resize resource respect restore restricted result result_cache resumable resume retention return returning returns reuse reverse revoke right rlike role roles rollback rolling rollup round row row_count rowdependencies rowid rownum rows rtrim rules safe salt sample save savepoint sb1 sb2 sb4 scan schema schemacheck scn scope scroll sdo_georaster sdo_topo_geometry search sec_to_time second section securefile security seed segment select self sequence sequential serializable server servererror session session_user sessions_per_user set sets settings sha sha1 sha2 share shared shared_pool short show shrink shutdown si_averagecolor si_colorhistogram si_featurelist si_positionalcolor si_stillimage si_texture siblings sid sign sin size size_t sizes skip slave sleep smalldatetimefromparts smallfile snapshot some soname sort soundex source space sparse spfile split sql sql_big_result sql_buffer_result sql_cache sql_calc_found_rows sql_small_result sql_variant_property sqlcode sqldata sqlerror sqlname sqlstate sqrt square standalone standby start starting startup statement static statistics stats_binomial_test stats_crosstab stats_ks_test stats_mode stats_mw_test stats_one_way_anova stats_t_test_ stats_t_test_indep stats_t_test_one stats_t_test_paired stats_wsr_test status std stddev stddev_pop stddev_samp stdev stop storage store stored str str_to_date straight_join strcmp strict string struct stuff style subdate subpartition subpartitions substitutable substr substring subtime subtring_index subtype success sum suspend switch switchoffset switchover sync synchronous synonym sys sys_xmlagg sysasm sysaux sysdate sysdatetimeoffset sysdba sysoper system system_user sysutcdatetime table tables tablespace tan tdo template temporary terminated tertiary_weights test than then thread through tier ties time time_format time_zone timediff timefromparts timeout timestamp timestampadd timestampdiff timezone_abbr timezone_minute timezone_region to to_base64 to_date to_days to_seconds todatetimeoffset trace tracking transaction transactional translate translation treat trigger trigger_nestlevel triggers trim truncate try_cast try_convert try_parse type ub1 ub2 ub4 ucase unarchived unbounded uncompress under undo unhex unicode uniform uninstall union unique unix_timestamp unknown unlimited unlock unpivot unrecoverable unsafe unsigned until untrusted unusable unused update updated upgrade upped upper upsert url urowid usable usage use use_stored_outlines user user_data user_resources users using utc_date utc_timestamp uuid uuid_short validate validate_password_strength validation valist value values var var_samp varcharc vari varia variab variabl variable variables variance varp varraw varrawc varray verify version versions view virtual visible void wait wallet warning warnings week weekday weekofyear wellformed when whene whenev wheneve whenever where while whitespace with within without work wrapped xdb xml xmlagg xmlattributes xmlcast xmlcolattval xmlelement xmlexists xmlforest xmlindex xmlnamespaces xmlpi xmlquery xmlroot xmlschema xmlserialize xmltable xmltype xor year year_to_month years yearweek",
+literal:"true false null",built_in:"array bigint binary bit blob boolean char character date dec decimal float int int8 integer interval number numeric real record serial serial8 smallint text varchar varying void"},contains:[{className:"string",begin:"'",end:"'",contains:[a.BACKSLASH_ESCAPE,{begin:"''"}]},{className:"string",begin:'"',end:'"',contains:[a.BACKSLASH_ESCAPE,{begin:'""'}]},{className:"string",begin:"`",end:"`",contains:[a.BACKSLASH_ESCAPE]},a.C_NUMBER_MODE,a.C_BLOCK_COMMENT_MODE,b]},
+a.C_BLOCK_COMMENT_MODE,b]}});return b});
diff --git a/lib/js/BUCK b/lib/js/BUCK
index 275941c..d6d8b3c 100644
--- a/lib/js/BUCK
+++ b/lib/js/BUCK
@@ -402,3 +402,18 @@
   sha1 = '8ba97a4a279ec6973a19b171c462a7b5cf454fb9',
 )
 
+# Zip highlightjs so that it can be imported as though it were a
+# bower_component and also attach the library license to the Buck dependency
+# graph.
+HLJS_DIR = 'bower_components/highlightjs'
+genrule(
+  name = 'highlightjs',
+  cmd = ' && '.join([
+    'mkdir -p %s' % HLJS_DIR,
+    'cp $(location //lib/highlightjs:highlightjs) %s/highlight.min.js' % HLJS_DIR,
+    'zip -r $OUT bower_components',
+  ]),
+  out = 'highlightjs.zip',
+  license = 'highlightjs',
+  visibility = ['PUBLIC'],
+)
diff --git a/polygerrit-ui/BUCK b/polygerrit-ui/BUCK
index 614e85c..f53182c 100644
--- a/polygerrit-ui/BUCK
+++ b/polygerrit-ui/BUCK
@@ -4,6 +4,7 @@
   name = 'polygerrit_components',
   deps = [
     '//lib/js:fetch',
+    '//lib/js:highlightjs',
     '//lib/js:iron-autogrow-textarea',
     '//lib/js:iron-dropdown',
     '//lib/js:iron-input',
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.html b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.html
index 3cad9d9..972ba98 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.html
@@ -16,6 +16,7 @@
 <link rel="import" href="../../../bower_components/polymer/polymer.html">
 <link rel="import" href="../gr-diff-processor/gr-diff-processor.html">
 <link rel="import" href="../gr-ranged-comment-layer/gr-ranged-comment-layer.html">
+<link rel="import" href="../gr-syntax-layer/gr-syntax-layer.html">
 
 <dom-module id="gr-diff-builder">
   <template>
@@ -25,6 +26,9 @@
     <gr-ranged-comment-layer
         id="rangeLayer"
         comments="[[comments]]"></gr-ranged-comment-layer>
+    <gr-syntax-layer
+        id="syntaxLayer"
+        diff="[[diff]]"></gr-syntax-layer>
     <gr-diff-processor
         id="processor"
         groups="{{_groups}}"></gr-diff-processor>
@@ -77,6 +81,7 @@
         attached: function() {
           // Setup annotation layers.
           this._layers = [
+            this.$.syntaxLayer,
             this._createIntralineLayer(),
             this.$.rangeLayer,
           ];
@@ -85,6 +90,7 @@
         render: function(comments, prefs) {
           // Stop the processor (if it's running).
           this.$.processor.cancel();
+          this.$.syntaxLayer.cancel();
 
           this._builder = this._getDiffBuilder(this.diff, comments, prefs);
 
@@ -98,6 +104,7 @@
             if (this.isImageDiff) {
               this._builder.renderDiffImages();
             }
+            this.$.syntaxLayer.process();
             console.timeEnd('diff render');
             this.fire('render');
           }.bind(this));
@@ -280,7 +287,7 @@
             // differences to highlight and apply them to the element as
             // annotations.
             annotate: function(el, line, GrAnnotation) {
-              var HL_CLASS = 'style-scope gr-diff';
+              var HL_CLASS = 'style-scope gr-diff intraline';
               line.highlights.forEach(function(highlight) {
                 // The start and end indices could be the same if a highlight is
                 // meant to start at the end of a line and continue onto the
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.js b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.js
index 816e3a4..2fcf23d 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.js
+++ b/polygerrit-ui/app/elements/diff/gr-diff-builder/gr-diff-builder.js
@@ -137,7 +137,6 @@
   GrDiffBuilder.prototype.findLinesByRange = function(start, end, opt_side,
       out_lines, out_elements) {
     var groups = this.getGroupsByLineRange(start, end, opt_side);
-
     groups.forEach(function(group) {
       var content = null;
       group.lines.forEach(function(line) {
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_test.html b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_test.html
index 45adb37..d1ca2b0 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_test.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-highlight/gr-diff-highlight_test.html
@@ -176,7 +176,7 @@
       test('comment-mouse-over from ranged comment causes set', function() {
         sandbox.stub(element, 'set');
         sandbox.stub(element, '_indexOfComment').returns(0);
-        element.fire('comment-mouse-over', {comment: {range:{}}});
+        element.fire('comment-mouse-over', {comment: {range: {}}});
         assert.isTrue(element.set.called);
       });
 
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 33322df..e09e125 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -101,14 +101,14 @@
         max-width: var(--content-width, 80ch);
         min-width: var(--content-width, 80ch);
       }
-      .content.add hl,
+      .content.add .intraline,
       .content.add.darkHighlight {
         background-color: var(--dark-add-highlight-color);
       }
       .content.add.lightHighlight {
         background-color: var(--light-add-highlight-color);
       }
-      .content.remove hl,
+      .content.remove .intraline,
       .content.remove.darkHighlight {
         background-color: var(--dark-remove-highlight-color);
       }
@@ -140,6 +140,82 @@
         content: '\00BB';
         position: absolute;
       }
+
+      /* Syntax highlights */
+      /* Highlight.js emits the following classes that do not have styles here:
+          subst, symbol, class, function, doctag, meta-string, section,
+          builtin-name, bulletm, code, formula, quote, addition, deletion
+        See:
+          http://highlightjs.readthedocs.io/en/latest/css-classes-reference.html
+      */
+      .gr-syntax-literal,
+      .gr-syntax-keyword,
+      .gr-syntax-selector-tag {
+        font-weight: bold;
+        color: #00f;
+      }
+      .gr-syntax-built_in {
+        color: #555;
+      }
+      .gr-syntax-type,
+      .gr-syntax-selector-pseudo,
+      .gr-syntax-template-variable {
+        color: #ff00e7;
+      }
+      .gr-syntax-number {
+        color: violet;
+      }
+      .gr-syntax-regexp,
+      .gr-syntax-variable,
+      .gr-syntax-selector-attr,
+      .gr-syntax-template-tag {
+        color: #FA8602;
+      }
+      .gr-syntax-string,
+      .gr-syntax-selector-id {
+        color: #018846;
+      }
+      .gr-syntax-title {
+        color: teal;
+      }
+      .gr-syntax-params {
+        color: red;
+      }
+      .gr-syntax-comment {
+        color: #af72a9;
+        font-style: italic;
+      }
+      .gr-syntax-meta {
+        color: #0091AD;
+      }
+      .gr-syntax-meta-keyword {
+        color: #00426b;
+        font-weight: bold;
+      }
+      .gr-syntax-tag {
+        color: #DB7C00;
+      }
+      .gr-syntax-name { /* XML/HTML Tag Name */
+        color: brown;
+      }
+      .gr-syntax-attr { /* XML/HTML Attribute */
+        color: #8C7250;
+      }
+      .gr-syntax-attribute { /* CSS Property */
+        color: #299596;
+      }
+      .gr-syntax-emphasis {
+        font-style: italic;
+      }
+      .gr-syntax-strong {
+        font-weight: bold;
+      }
+      .gr-syntax-link {
+        color: blue;
+      }
+      .gr-syntax-selector-class {
+        color: #1F71FF;
+      }
     </style>
     <div class$="[[_computeContainerClass(_loggedIn, viewMode)]]"
         on-tap="_handleTap">
diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.html b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.html
new file mode 100644
index 0000000..d331ccd
--- /dev/null
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.html
@@ -0,0 +1,22 @@
+<!--
+Copyright (C) 2016 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.
+-->
+<link rel="import" href="../../../bower_components/polymer/polymer.html">
+<script src="../../../bower_components/highlightjs/highlight.min.js"></script>
+<dom-module id="gr-syntax-layer">
+  <script src="../gr-diff/gr-diff-line.js"></script>
+  <script src="../gr-diff-highlight/gr-annotation.js"></script>
+  <script src="gr-syntax-layer.js"></script>
+</dom-module>
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
new file mode 100644
index 0000000..3ec8ddd
--- /dev/null
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer.js
@@ -0,0 +1,303 @@
+// Copyright (C) 2016 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.
+(function() {
+  'use strict';
+
+  var LANGUAGE_MAP = {
+    'application/json': 'json',
+    'text/css': 'css',
+    'text/html': 'html',
+    'text/javascript': 'js',
+    'text/x-c++src': 'cpp',
+    'text/x-go': 'go',
+    'text/x-haskell': 'haskell',
+    'text/x-java': 'java',
+    'text/x-markdown': 'markdown',
+    'text/x-objectivec': 'objectivec',
+    'text/x-perl': 'perl',
+    'text/x-python': 'python',
+    'text/x-sh': 'bash',
+    'text/x-sql': 'sql',
+    'text/x-scala': 'scala',
+  };
+
+  var ASYNC_DELAY = 10;
+
+  Polymer({
+    is: 'gr-syntax-layer',
+
+    properties: {
+      diff: {
+        type: Object,
+        observer: '_diffChanged',
+      },
+      _baseRanges: {
+        type: Array,
+        value: function() { return []; },
+      },
+      _revisionRanges: {
+        type: Array,
+        value: function() { return []; },
+      },
+      _baseLanguage: String,
+      _revisionLanguage: String,
+      _listeners: {
+        type: Array,
+        value: function() { return []; },
+      },
+      _processHandle: Number,
+    },
+
+    attached: function() {
+      hljs.configure({classPrefix: 'gr-diff gr-syntax gr-syntax-'});
+    },
+
+    addListener: function(fn) {
+      this.push('_listeners', fn);
+    },
+
+    /**
+     * Annotation layer method to add syntax annotations to the given element
+     * for the given line.
+     * @param {!HTMLElement} el
+     * @param {!GrDiffLine} line
+     */
+    annotate: function(el, line, GrAnnotation) {
+      // Determine the side.
+      var side;
+      if (line.type === GrDiffLine.Type.REMOVE || (
+          line.type === GrDiffLine.Type.BOTH &&
+          el.getAttribute('data-side') !== 'right')) {
+        side = 'left';
+      } else if (line.type === GrDiffLine.Type.ADD || (
+          el.getAttribute('data-side') !== 'left')) {
+        side = 'right';
+      }
+
+      // Find the relevant syntax ranges, if any.
+      var ranges = [];
+      if (side === 'left' && this._baseRanges.length >= line.beforeNumber) {
+        ranges = this._baseRanges[line.beforeNumber - 1] || [];
+      } else if (side === 'right' &&
+          this._revisionRanges.length >= line.afterNumber) {
+        ranges = this._revisionRanges[line.afterNumber - 1] || [];
+      }
+
+      // Apply the ranges to the element.
+      ranges.forEach(function(range) {
+        GrAnnotation.annotateElement(
+            el, range.start, range.length, range.className);
+      });
+    },
+
+    /**
+     * Start processing symtax for the loaded diff and notify layer listeners
+     * as syntax info comes online.
+     * @return {Promise}
+     */
+    process: function() {
+      if (!this.diff.content.length) { return Promise.resolve(); }
+
+      this.cancel();
+
+      if (this.diff.meta_a) {
+        this._baseLanguage = LANGUAGE_MAP[this.diff.meta_a.content_type];
+      }
+      if (this.diff.meta_b) {
+        this._revisionLanguage = LANGUAGE_MAP[this.diff.meta_b.content_type];
+      }
+
+      var state = {
+        sectionIndex: 0,
+        lineIndex: 0,
+        baseContext: undefined,
+        revisionContext: undefined,
+        lineNums: {left: 1, right: 1},
+        lastNotify: {left: 1, right: 1},
+      };
+      this._baseRanges = [];
+      this._revisionRanges = [];
+
+      return new Promise(function(resolve) {
+        var nextStep = function() {
+          this._processHandle = null;
+          this._processNextLine(state);
+
+          // Move to the next line in the section.
+          state.lineIndex++;
+
+          // If the section has been exhausted, move to the next one.
+          if (this._isSectionDone(state)) {
+            state.lineIndex = 0;
+            state.sectionIndex++;
+          }
+
+          // If all sections have been exhausted, finish.
+          if (state.sectionIndex >= this.diff.content.length) {
+            resolve();
+            this._notify(state);
+            return;
+          }
+
+          if (state.sectionIndex !== 0 && state.lineIndex % 100 === 0) {
+            this._notify(state);
+            this._processHandle = this.async(nextStep, ASYNC_DELAY);
+          } else {
+            nextStep.call(this);
+          }
+        };
+
+        this._processHandle = this.async(nextStep, 1);
+      }.bind(this));
+    },
+
+    /**
+     * Cancel any asynchronous syntax processing jobs.
+     */
+    cancel: function() {
+      if (this._processHandle) {
+        this.cancelAsync(this._processHandle);
+        this._processHandle = null;
+      }
+    },
+
+    _diffChanged: function() {
+      this.cancel();
+      this._baseRanges = [];
+      this._revisionRanges = [];
+    },
+
+    /**
+     * Take a string of HTML with the (potentially nested) syntax markers
+     * Highlight.js emits and emit a list of text ranges and classes for the
+     * markers.
+     * @param {string} str The string of HTML.
+     * @return {!Array<!Object>} The list of ranges.
+     */
+    _rangesFromString: function(str) {
+      var div = document.createElement('div');
+      div.innerHTML = str;
+      return this._rangesFromElement(div, 0);
+    },
+
+    _rangesFromElement: function(elem, offset) {
+      var result = [];
+      for (var i = 0; i < elem.childNodes.length; i++) {
+        var node = elem.childNodes[i];
+        var nodeLength = GrAnnotation.getLength(node);
+        // Note: HLJS may emit a span with class undefined when it thinks there
+        // may be a syntax error.
+        if (node.tagName === 'SPAN' && node.className !== 'undefined') {
+          result.push({
+            start: offset,
+            length: nodeLength,
+            className: node.className,
+          });
+          if (node.children.length) {
+            result = result.concat(this._rangesFromElement(node, offset));
+          }
+        }
+        offset += nodeLength;
+      }
+      return result;
+    },
+
+    /**
+     * For a given state, process the syntax for the next line (or pair of
+     * lines).
+     * @param {!Object} state The processing state for the layer.
+     */
+    _processNextLine: function(state) {
+      var baseLine = undefined;
+      var revisionLine = undefined;
+
+      var section = this.diff.content[state.sectionIndex];
+      if (section.ab) {
+        baseLine = section.ab[state.lineIndex];
+        revisionLine = section.ab[state.lineIndex];
+        state.lineNums.left++;
+        state.lineNums.right++;
+      } else {
+        if (section.a && section.a.length > state.lineIndex) {
+          baseLine = section.a[state.lineIndex];
+          state.lineNums.left++;
+        }
+        if (section.b && section.b.length > state.lineIndex) {
+          revisionLine = section.b[state.lineIndex];
+          state.lineNums.right++;
+        }
+      }
+
+      // To store the result of the syntax highlighter.
+      var result;
+
+      if (this._baseLanguage && baseLine !== undefined) {
+        result = hljs.highlight(this._baseLanguage, baseLine, true,
+            state.baseContext);
+        this.push('_baseRanges', this._rangesFromString(result.value));
+        state.baseContext = result.top;
+      }
+
+      if (this._revisionLanguage && revisionLine !== undefined) {
+        result = hljs.highlight(this._revisionLanguage, revisionLine, true,
+            state.revisionContext);
+        this.push('_revisionRanges', this._rangesFromString(result.value));
+        state.revisionContext = result.top;
+      }
+    },
+
+    /**
+     * Tells whether the state has exhausted its current section.
+     * @param {!Object} state
+     * @return {boolean}
+     */
+    _isSectionDone: function(state) {
+      var section = this.diff.content[state.sectionIndex];
+      if (section.ab) {
+        return state.lineIndex >= section.ab.length;
+      } else {
+        return (!section.a || state.lineIndex >= section.a.length) &&
+            (!section.b || state.lineIndex >= section.b.length);
+      }
+    },
+
+    /**
+     * For a given state, notify layer listeners of any processed line ranges
+     * that have not yet been notified.
+     * @param {!Object} state
+     */
+    _notify: function(state) {
+      if (state.lineNums.left - state.lastNotify.left) {
+        this._notifyRange(
+          state.lastNotify.left,
+          state.lineNums.left,
+          'left');
+        state.lastNotify.left = state.lineNums.left;
+      }
+      if (state.lineNums.right - state.lastNotify.right) {
+        this._notifyRange(
+          state.lastNotify.right,
+          state.lineNums.right,
+          'right');
+        state.lastNotify.right = state.lineNums.right;
+      }
+    },
+
+    _notifyRange: function(start, end, side) {
+      this._listeners.forEach(function(fn) {
+        fn(start, end, side);
+      });
+    },
+  });
+})();
diff --git a/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_test.html b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_test.html
new file mode 100644
index 0000000..36f6aaf
--- /dev/null
+++ b/polygerrit-ui/app/elements/diff/gr-syntax-layer/gr-syntax-layer_test.html
@@ -0,0 +1,309 @@
+<!DOCTYPE html>
+<!--
+Copyright (C) 2016 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.
+-->
+
+<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
+<title>gr-syntax-layer</title>
+
+<script src="../../../bower_components/webcomponentsjs/webcomponents.min.js"></script>
+<script src="../../../bower_components/web-component-tester/browser.js"></script>
+
+<link rel="import" href="../../shared/gr-rest-api-interface/mock-diff-response_test.html">
+<link rel="import" href="gr-syntax-layer.html">
+
+<test-fixture id="basic">
+  <template>
+    <gr-syntax-layer></gr-syntax-layer>
+  </template>
+</test-fixture>
+
+<script>
+  suite('gr-syntax-layer tests', function() {
+    var sandbox;
+    var diff;
+    var element;
+
+    setup(function() {
+      sandbox = sinon.sandbox.create();
+      element = fixture('basic');
+      var mock = document.createElement('mock-diff-response');
+      diff = mock.diffResponse;
+      element.diff = diff;
+    });
+
+    teardown(function() {
+      sandbox.restore();
+    });
+
+    test('annotate without range does nothing', function() {
+      var annotationSpy = sandbox.spy(GrAnnotation, 'annotateElement');
+      var el = document.createElement('div');
+      el.textContent = 'Etiam dui, blandit wisi.';
+      var line = new GrDiffLine(GrDiffLine.Type.REMOVE);
+      line.beforeNumber = 12;
+
+      element.annotate(el, line, GrAnnotation);
+
+      assert.isFalse(annotationSpy.called);
+    });
+
+    test('annotate with range applies it', function() {
+      var str = 'Etiam dui, blandit wisi.';
+      var start = 6;
+      var length = 3;
+      var className = 'foobar';
+
+      var annotationSpy = sandbox.spy(GrAnnotation, 'annotateElement');
+      var el = document.createElement('div');
+      el.textContent = str;
+      var line = new GrDiffLine(GrDiffLine.Type.REMOVE);
+      line.beforeNumber = 12;
+      element._baseRanges[11] = [{
+        start: start,
+        length: length,
+        className: className,
+      }];
+
+      element.annotate(el, line, GrAnnotation);
+
+      assert.isTrue(annotationSpy.called);
+      assert.equal(annotationSpy.lastCall.args[0], el);
+      assert.equal(annotationSpy.lastCall.args[1], start);
+      assert.equal(annotationSpy.lastCall.args[2], length);
+      assert.equal(annotationSpy.lastCall.args[3], className);
+      assert.isOk(el.querySelector('hl.' + className));
+    });
+
+    test('process on empty diff does nothing', function(done) {
+      element.diff = {
+        meta_a: {content_type: 'application/json'},
+        meta_b: {content_type: 'application/json'},
+        content: [],
+      };
+      var processNextSpy = sandbox.spy(element, '_processNextLine');
+
+      var processPromise = element.process();
+
+      processPromise.then(function() {
+        assert.isFalse(processNextSpy.called);
+        assert.equal(element._baseRanges.length, 0);
+        assert.equal(element._revisionRanges.length, 0);
+        done();
+      });
+    });
+
+    test('process highlight ipsum', function(done) {
+      element.diff.meta_a.content_type = 'application/json';
+      element.diff.meta_b.content_type = 'application/json';
+      var processNextSpy = sandbox.spy(element, '_processNextLine');
+      var highlightStub = sandbox.stub(hljs, 'highlight', function(
+          lang, line, ignore, state) {
+        return {
+          value: line.replace(/ipsum/, '<span class="foobar">ipsum</span>'),
+          top: state === undefined ? 1 : state + 1,
+        };
+      });
+
+      var processPromise = element.process();
+
+      processPromise.then(function() {
+        var linesA = diff.meta_a.lines;
+        var linesB = diff.meta_b.lines;
+
+        assert.isTrue(processNextSpy.called);
+        assert.equal(element._baseRanges.length, linesA);
+        assert.equal(element._revisionRanges.length, linesB);
+
+        assert.equal(highlightStub.callCount, linesA + linesB);
+
+        // The first line of both sides have a range.
+        [element._baseRanges[0], element._revisionRanges[0]]
+            .forEach(function(range) {
+              assert.equal(range.length, 1);
+              assert.equal(range[0].className, 'foobar');
+              assert.equal(range[0].start, 'lorem '.length);
+              assert.equal(range[0].length, 'ipsum'.length);
+            });
+
+        // There are no ranges from ll.1-12 on the left and ll.1-11 on the
+        // right.
+        element._baseRanges.slice(1, 12)
+            .concat(element._revisionRanges.slice(1, 11))
+            .forEach(function(range) {
+              assert.equal(range.length, 0);
+            });
+
+        // There should be another pair of ranges on l.13 for the left and l.12
+        // for the right.
+        [element._baseRanges[13], element._revisionRanges[12]]
+            .forEach(function(range) {
+              assert.equal(range.length, 1);
+              assert.equal(range[0].className, 'foobar');
+              assert.equal(range[0].start, 32);
+              assert.equal(range[0].length, 'ipsum'.length);
+            });
+
+        // The next group should have a similar instance on either side.
+
+        var range = element._baseRanges[15];
+        assert.equal(range.length, 1);
+        assert.equal(range[0].className, 'foobar');
+        assert.equal(range[0].start, 34);
+        assert.equal(range[0].length, 'ipsum'.length);
+
+        range = element._revisionRanges[14];
+        assert.equal(range.length, 1);
+        assert.equal(range[0].className, 'foobar');
+        assert.equal(range[0].start, 35);
+        assert.equal(range[0].length, 'ipsum'.length);
+
+        done();
+      });
+    });
+
+    test('_diffChanged calls cancel', function() {
+      var cancelSpy = sandbox.spy(element, '_diffChanged');
+      element.diff = {content: []};
+      assert.isTrue(cancelSpy.called);
+    });
+
+    test('_rangesFromElement no ranges', function() {
+      var elem = document.createElement('span');
+      elem.textContent = 'Etiam dui, blandit wisi.';
+      var offset = 100;
+
+      var result = element._rangesFromElement(elem, offset);
+
+      assert.equal(result.length, 0);
+    });
+
+    test('_rangesFromElement single range', function() {
+      var str0 = 'Etiam ';
+      var str1 = 'dui, blandit';
+      var str2 = ' wisi.';
+      var className = 'theclass';
+      var offset = 100;
+
+      var elem = document.createElement('span');
+      elem.appendChild(document.createTextNode(str0));
+      var span = document.createElement('span');
+      span.textContent = str1;
+      span.className = className;
+      elem.appendChild(span);
+      elem.appendChild(document.createTextNode(str2));
+
+      var result = element._rangesFromElement(elem, offset);
+
+      assert.equal(result.length, 1);
+      assert.equal(result[0].start, str0.length + offset);
+      assert.equal(result[0].length, str1.length);
+      assert.equal(result[0].className, className);
+    });
+
+    test('_rangesFromElement milti range', function() {
+      var str0 = 'Etiam ';
+      var str1 = 'dui,';
+      var str2 = ' blandit';
+      var str3 = ' wisi.';
+      var className = 'theclass';
+      var offset = 100;
+
+      var elem = document.createElement('span');
+      elem.appendChild(document.createTextNode(str0));
+      var span = document.createElement('span');
+      span.textContent = str1;
+      span.className = className;
+      elem.appendChild(span);
+      elem.appendChild(document.createTextNode(str2));
+      span = document.createElement('span');
+      span.textContent = str3;
+      span.className = className;
+      elem.appendChild(span);
+
+      var result = element._rangesFromElement(elem, offset);
+
+      assert.equal(result.length, 2);
+
+      assert.equal(result[0].start, str0.length + offset);
+      assert.equal(result[0].length, str1.length);
+      assert.equal(result[0].className, className);
+
+      assert.equal(result[1].start,
+          str0.length + str1.length + str2.length + offset);
+      assert.equal(result[1].length, str3.length);
+      assert.equal(result[1].className, className);
+    });
+
+    test('_rangesFromElement nested range', function() {
+      var str0 = 'Etiam ';
+      var str1 = 'dui,';
+      var str2 = ' blandit';
+      var str3 = ' wisi.';
+      var className = 'theclass';
+      var offset = 100;
+
+      var elem = document.createElement('span');
+      elem.appendChild(document.createTextNode(str0));
+      var span1 = document.createElement('span');
+      span1.textContent = str1;
+      span1.className = className;
+      elem.appendChild(span1);
+      var span2 = document.createElement('span');
+      span2.textContent = str2;
+      span2.className = className;
+      span1.appendChild(span2);
+      elem.appendChild(document.createTextNode(str3));
+
+      var result = element._rangesFromElement(elem, offset);
+
+      assert.equal(result.length, 2);
+
+      assert.equal(result[0].start, str0.length + offset);
+      assert.equal(result[0].length, str1.length + str2.length);
+      assert.equal(result[0].className, className);
+
+      assert.equal(result[1].start, str0.length + str1.length + offset);
+      assert.equal(result[1].length, str2.length);
+      assert.equal(result[1].className, className);
+    });
+
+    test('_isSectionDone', function() {
+      var state = {sectionIndex: 0, lineIndex: 0};
+      assert.isFalse(element._isSectionDone(state));
+
+      state = {sectionIndex: 0, lineIndex: 2};
+      assert.isFalse(element._isSectionDone(state));
+
+      state = {sectionIndex: 0, lineIndex: 4};
+      assert.isTrue(element._isSectionDone(state));
+
+      state = {sectionIndex: 1, lineIndex: 2};
+      assert.isFalse(element._isSectionDone(state));
+
+      state = {sectionIndex: 1, lineIndex: 3};
+      assert.isTrue(element._isSectionDone(state));
+
+      state = {sectionIndex: 3, lineIndex: 0};
+      assert.isFalse(element._isSectionDone(state));
+
+      state = {sectionIndex: 3, lineIndex: 3};
+      assert.isFalse(element._isSectionDone(state));
+
+      state = {sectionIndex: 3, lineIndex: 4};
+      assert.isTrue(element._isSectionDone(state));
+    });
+  });
+</script>
diff --git a/polygerrit-ui/app/test/index.html b/polygerrit-ui/app/test/index.html
index a7337f4..d3cb316 100644
--- a/polygerrit-ui/app/test/index.html
+++ b/polygerrit-ui/app/test/index.html
@@ -60,6 +60,7 @@
     'diff/gr-patch-range-select/gr-patch-range-select_test.html',
     'diff/gr-ranged-comment-layer/gr-ranged-comment-layer_test.html',
     'diff/gr-selection-action-box/gr-selection-action-box_test.html',
+    'diff/gr-syntax-layer/gr-syntax-layer_test.html',
     'settings/gr-account-info/gr-account-info_test.html',
     'settings/gr-email-editor/gr-email-editor_test.html',
     'settings/gr-group-list/gr-group-list_test.html',