Try to fix incremental_trailing_whitespace_a.html

This includes w3c/wptrunner#219
servo · emilio · Nov 19, 2016 · Nov 19, 2016 · Nov 19, 2016 · cfca049753f732282a9e85e7c4e54f1dad565df9
commit cfca049753f732282a9e85e7c4e54f1dad565df9
diff --git a/tests/wpt/harness/wptrunner/executors/reftest-wait_servodriver.js b/tests/wpt/harness/wptrunner/executors/reftest-wait_servodriver.js
@@ -6,7 +6,8 @@
 callback = arguments[arguments.length - 1];
 
 function check_done() {
-    if (!document.body.classList.contains('reftest-wait')) {
+    if (!document.body.classList.contains('reftest-wait') &&
+        !document.documentElement.classList.contains('reftest-wait')) {
         callback();
     } else {
         setTimeout(check_done, 50);

diff --git a/tests/wpt/mozilla/tests/css/incremental_trailing_whitespace_a.html b/tests/wpt/mozilla/tests/css/incremental_trailing_whitespace_a.html
@@ -1,9 +1,10 @@
 <!doctype html>
-<html>
+<html class="reftest-wait">
   <head>
     <meta charset="utf-8">
     <title>incremental trailing whitespace test</title>
     <link rel="match" href="incremental_trailing_whitespace_ref.html">
+    <script src="/common/reftest-wait.js"></script>
     <style>
       #a {
         border: 0 solid;
@@ -20,8 +21,14 @@
     </div>
     <script>
       document.body.offsetWidth; // force layout
-      document.querySelector('#a').classList.add('go');
-      // FIXME (#10245): Wait for the "transitionend" event.
+      var div = document.getElementById('a');
+      div.addEventListener('transitionend', function() {
+        // FIXME(emilio, #13865): requestAnimationFrame shouldn't be needed.
+        requestAnimationFrame(function() {
+          document.documentElement.classList.remove('reftest-wait');
+        });
+      });
+      div.classList.add('go');
     </script>
   </body>
 </html>