1 files changed, 40 insertions, 44 deletions
diff --git a/tests/wpt/web-platform-tests/web-animations/interfaces/AnimationEffectTiming/iterationStart.html b/tests/wpt/web-platform-tests/web-animations/interfaces/AnimationEffectTiming/iterationStart.html
index ed2d0e097ac..5521f1e8594 100644
--- a/tests/wpt/web-platform-tests/web-animations/interfaces/AnimationEffectTiming/iterationStart.html
+++ b/tests/wpt/web-platform-tests/web-animations/interfaces/AnimationEffectTiming/iterationStart.html
@@ -1,8 +1,7 @@
 <!DOCTYPE html>
 <meta charset=utf-8>
-<title>iterationStart tests</title>
-<link rel="help" href="https://w3c.github.io/web-animations/#dom-animationeffecttiming-iterationstart">
-<link rel="author" title="Daisuke Akatsuka" href="mailto:daisuke@mozilla-japan.org">
+<title>AnimationEffectTiming.iterationStart</title>
+<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animationeffecttiming-iterationstart">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="../../testcommon.js"></script>
@@ -11,66 +10,63 @@
 <script>
 'use strict';
 
-test(function(t) {
-  var anim = createDiv(t).animate(null);
+test(t => {
+  const anim = createDiv(t).animate(null);
   assert_equals(anim.effect.timing.iterationStart, 0);
-}, 'Test default value');
+}, 'Has the default value 0');
 
-test(function(t) {
-  var div = createDiv(t);
-  var anim = div.animate({ opacity: [ 0, 1 ] },
-                         { iterationStart: 0.2,
-                           iterations: 1,
-                           fill: 'both',
-                           duration: 100,
-                           delay: 1 });
+test(t => {
+  const div = createDiv(t);
+  const anim = div.animate({ opacity: [ 0, 1 ] },
+                           { iterationStart: 0.2,
+                             iterations: 1,
+                             fill: 'both',
+                             duration: 100,
+                             delay: 1 });
   anim.effect.timing.iterationStart = 2.5;
   assert_times_equal(anim.effect.getComputedTiming().progress, 0.5);
   assert_equals(anim.effect.getComputedTiming().currentIteration, 2);
-}, 'Test that changing the iterationStart affects computed timing ' +
-   'when backwards-filling');
+}, 'Changing the value updates computed timing when backwards-filling');
 
-test(function(t) {
-  var div = createDiv(t);
-  var anim = div.animate({ opacity: [ 0, 1 ] },
-                         { iterationStart: 0.2,
-                           iterations: 1,
-                           fill: 'both',
-                           duration: 100,
-                           delay: 0 });
+test(t => {
+  const div = createDiv(t);
+  const anim = div.animate({ opacity: [ 0, 1 ] },
+                           { iterationStart: 0.2,
+                             iterations: 1,
+                             fill: 'both',
+                             duration: 100,
+                             delay: 0 });
   anim.effect.timing.iterationStart = 2.5;
   assert_times_equal(anim.effect.getComputedTiming().progress, 0.5);
   assert_equals(anim.effect.getComputedTiming().currentIteration, 2);
-}, 'Test that changing the iterationStart affects computed timing ' +
-   'during the active phase');
+}, 'Changing the value updates computed timing during the active phase');
 
-test(function(t) {
-  var div = createDiv(t);
-  var anim = div.animate({ opacity: [ 0, 1 ] },
-                         { iterationStart: 0.2,
-                           iterations: 1,
-                           fill: 'both',
-                           duration: 100,
-                           delay: 0 });
+test(t => {
+  const div = createDiv(t);
+  const anim = div.animate({ opacity: [ 0, 1 ] },
+                           { iterationStart: 0.2,
+                             iterations: 1,
+                             fill: 'both',
+                             duration: 100,
+                             delay: 0 });
   anim.finish();
   anim.effect.timing.iterationStart = 2.5;
   assert_times_equal(anim.effect.getComputedTiming().progress, 0.5);
   assert_equals(anim.effect.getComputedTiming().currentIteration, 3);
-}, 'Test that changing the iterationStart affects computed timing ' +
-   'when forwards-filling');
+}, 'Changing the value updates computed timing when forwards-filling');
 
-test(function(t) {
-  var div = createDiv(t);
-  var anim = div.animate(null);
+test(t => {
+  const div = createDiv(t);
+  const anim = div.animate(null);
   for (let invalid of [-1, NaN, Infinity]) {
-    assert_throws({ name: 'TypeError' }, function() {
+    assert_throws({ name: 'TypeError' }, () => {
       anim.effect.timing.iterationStart = invalid;
-    }, 'setting ' + invalid);
-    assert_throws({ name: 'TypeError' }, function() {
+    }, `setting ${invalid}`);
+    assert_throws({ name: 'TypeError' }, () => {
       div.animate({}, { iterationStart: invalid });
-    }, 'animate() with ' + invalid);
+    }, `animate() with ${invalid}`);
   }
-}, 'Using invalid values should throw TypeError');
+}, 'Throws when setting invalid values');
 
 </script>
 </body>