diff --git a/python/servo/testing_commands.py b/python/servo/testing_commands.py
index 9c322694f12e..17d743a3f6d4 100644
--- a/python/servo/testing_commands.py
+++ b/python/servo/testing_commands.py
@@ -934,7 +934,7 @@ def update_net_cookies(self):
     @Command('update-webgl',
              description='Update the WebGL conformance suite tests from Khronos repo',
              category='testing')
-    @CommandArgument('--version', action='store_true', default='1.0.3',
+    @CommandArgument('--version', default='2.0.0',
                      help='WebGL conformance suite version')
     def update_webgl(self, version=None):
         self.ensure_bootstrapped()
diff --git a/tests/wpt/mozilla/tests/webgl/tools/import-conformance-tests.py b/tests/wpt/mozilla/tests/webgl/tools/import-conformance-tests.py
index 8712a3d2de5a..fdedb71989dd 100755
--- a/tests/wpt/mozilla/tests/webgl/tools/import-conformance-tests.py
+++ b/tests/wpt/mozilla/tests/webgl/tools/import-conformance-tests.py
@@ -9,10 +9,16 @@
 import argparse
 
 KHRONOS_REPO_URL = "https://github.com/KhronosGroup/WebGL.git"
-PATCHES = [
+# Patches for conformance tests 1.0.x
+PATCHES_1X = [
     ("js-test-pre.patch", "resources/js-test-pre.js"),
     ("unit.patch", "conformance/more/unit.js")
 ]
+# Patches for conformance tests 2.0.x
+PATCHES_2X = [
+    ("js-test-pre2.patch", "js/js-test-pre.js"),
+    ("unit.patch", "conformance/more/unit.js")
+]
 
 # Fix for 'UnicodeDecodeError: 'ascii' codec can't decode byte'
 reload(sys)  
@@ -124,7 +130,8 @@ def update_conformance(version, destination, existing_repo, patches_dir):
     # Try to apply the patches to the required files
     if not patches_dir:
         patches_dir = os.path.abspath(os.path.dirname(sys.argv[0]))
-    for patch, file_name in PATCHES:
+    patches = PATCHES_2X if version.startswith('2') else PATCHES_1X
+    for patch, file_name in patches:
         try:
             patch = os.path.join(patches_dir, patch)
             subprocess.check_call(["patch", "-d", destination, file_name, patch])
diff --git a/tests/wpt/mozilla/tests/webgl/tools/js-test-pre2.patch b/tests/wpt/mozilla/tests/webgl/tools/js-test-pre2.patch
new file mode 100644
index 000000000000..13cb667374c8
--- /dev/null
+++ b/tests/wpt/mozilla/tests/webgl/tools/js-test-pre2.patch
@@ -0,0 +1,84 @@
+diff --git a/conformance-suites/2.0.0/js/js-test-pre.js b/conformance-suites/2.0.0/js/js-test-pre.js
+index df30a6f..7ca8559 100644
+--- a/conformance-suites/2.0.0/js/js-test-pre.js
++++ b/conformance-suites/2.0.0/js/js-test-pre.js
+@@ -111,11 +111,25 @@ function nonKhronosFrameworkNotifyDone() {
+   }
+ }
+ 
+-function reportTestResultsToHarness(success, msg) {
+-  if (window.parent.webglTestHarness) {
+-    window.parent.webglTestHarness.reportResults(window.location.pathname, success, msg);
+-  }
+-}
++(function() {
++    var WPT_TEST_ID = 0;
++  
++    // Store the current WPT test harness `test` function
++    // if found, since it's overriden by some tests.
++    var wpt_test = window.test;
++    var wpt_assert_true = window.assert_true;
++    var wt_async_test = window.async_test;
++  
++    window.reportTestResultsToHarness = function reportTestResultsToHarness(success, msg) {
++      if (window.parent.webglTestHarness) {
++        window.parent.webglTestHarness.reportResults(window.location.pathname, success, msg);
++      } else if (wpt_test) { // WPT test harness
++        wpt_test(function () {
++          wpt_assert_true(success, msg);
++        }, "WebGL test #" + (WPT_TEST_ID++) + ": " + msg);
++      }
++    }
++ }())
+ 
+ function reportSkippedTestResultsToHarness(success, msg) {
+   if (window.parent.webglTestHarness) {
+@@ -132,6 +146,12 @@ function notifyFinishedToHarness() {
+   }
+ }
+ 
++(function() {
++    var oldNotify = notifyFinishedToHarness;
++    var t = async_test("Overall test");
++    window.notifyFinishedToHarness = t.step_func_done(oldNotify);
++}())
++
+ var _bufferedConsoleLogs = [];
+ 
+ function _bufferedLogToConsole(msg)
+@@ -162,7 +182,7 @@ function _flushBufferedLogsToConsole()
+   }
+ }
+ 
+-var _jsTestPreVerboseLogging = false;
++var _jsTestPreVerboseLogging = true;
+ 
+ function enableJSTestPreVerboseLogging()
+ {
+@@ -175,24 +195,12 @@ function description(msg)
+     if (msg === undefined) {
+       msg = document.title;
+     }
+-    // For MSIE 6 compatibility
+-    var span = document.createElement("span");
+-    span.innerHTML = '<p>' + msg + '</p><p>On success, you will see a series of "<span class="pass">PASS</span>" messages, followed by "<span class="pass">TEST COMPLETE</span>".</p>';
+-    var description = document.getElementById("description");
+-    if (description.firstChild)
+-        description.replaceChild(span, description.firstChild);
+-    else
+-        description.appendChild(span);
+-    if (_jsTestPreVerboseLogging) {
+-        _bufferedLogToConsole(msg);
+-    }
++
++    _bufferedLogToConsole("DESCRIPTION: " +msg);
+ }
+ 
+ function _addSpan(contents)
+ {
+-    var span = document.createElement("span");
+-    document.getElementById("console").appendChild(span); // insert it first so XHTML knows the namespace
+-    span.innerHTML = contents + '<br />';
+ }
+ 
+ function debug(msg)