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The Tor Browser
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CSSTransition-currentTime.tentative.html (4568B)

      1 <!doctype html>
      2 <meta charset=utf-8>
      3 <title>CSSTransition.currentTime</title>
      4 <!-- TODO: Add a more specific link for this once it is specified. -->
      5 <link rel="help" href="https://drafts.csswg.org/css-transitions-2/#csstransition">
      6 <script src="/resources/testharness.js"></script>
      7 <script src="/resources/testharnessreport.js"></script>
      8 <script src="support/helper.js"></script>
      9 <div id="log"></div>
     10 <script>
     11 
     12 'use strict';
     13 
     14 const marginLeft = div => parseFloat(getComputedStyle(div).marginLeft);
     15 
     16 promise_test(async t => {
     17  const div = addDiv(t, {
     18    style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
     19  });
     20  getComputedStyle(div).marginLeft;
     21  div.style.marginLeft = '200px';
     22 
     23  const animation = div.getAnimations()[0];
     24  assert_equals(
     25    animation.currentTime,
     26    0,
     27    'currentTime should initially be zero'
     28  );
     29 
     30  await animation.ready;
     31 
     32  const seekTime = 150 * MS_PER_SEC;
     33  animation.currentTime = seekTime;
     34 
     35  assert_time_equals_literal(
     36    animation.currentTime,
     37    seekTime,
     38    'currentTime is updated'
     39  );
     40  assert_equals(getComputedStyle(div).marginLeft, '150px');
     41 }, 'currentTime can be used to seek a CSS transition');
     42 
     43 promise_test(async t => {
     44  const div = addDiv(t, {
     45    style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
     46  });
     47  const eventWatcher = new EventWatcher(t, div, 'transitionend');
     48  getComputedStyle(div).marginLeft;
     49  div.style.marginLeft = '200px';
     50 
     51  const animation = div.getAnimations()[0];
     52  await animation.ready;
     53 
     54  const marginLeft = () => parseFloat(getComputedStyle(div).marginLeft);
     55  assert_equals(marginLeft(div), 100);
     56 
     57  animation.currentTime = 100 * MS_PER_SEC;
     58  assert_equals(marginLeft(div), 100);
     59 
     60  animation.currentTime = 150 * MS_PER_SEC;
     61  assert_equals(marginLeft(div), 150);
     62 
     63  animation.currentTime = 200 * MS_PER_SEC;
     64  await eventWatcher.wait_for('transitionend');
     65  assert_equals(marginLeft(div), 200);
     66 }, 'Skipping forwards through transition');
     67 
     68 promise_test(async t => {
     69  const div = addDiv(t, {
     70    style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
     71  });
     72  const eventWatcher = new EventWatcher(t, div, 'transitionend');
     73  getComputedStyle(div).marginLeft;
     74  div.style.marginLeft = '200px';
     75 
     76  const animation = div.getAnimations()[0];
     77  await animation.ready;
     78 
     79  // Unlike in the case of CSS animations, we cannot skip to the end and skip
     80  // backwards since when we reach the end the transition effect is removed and
     81  // changes to the Animation object no longer affect the element. For
     82  // this reason we only skip forwards as far as the 50% through point.
     83 
     84  animation.currentTime = 150 * MS_PER_SEC;
     85  assert_equals(marginLeft(div), 150);
     86 
     87  animation.currentTime = 100 * MS_PER_SEC;
     88  assert_equals(marginLeft(div), 100);
     89 }, 'Skipping backwards through transition');
     90 
     91 promise_test(async t => {
     92  const div = addDiv(t, {
     93    style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
     94  });
     95  getComputedStyle(div).marginLeft;
     96  div.style.marginLeft = '200px';
     97  const animation = div.getAnimations()[0];
     98 
     99  await animation.ready;
    100 
    101  assert_throws_js(
    102    TypeError,
    103    () => {
    104      animation.currentTime = null;
    105    },
    106    'Expect TypeError exception on trying to set Animation.currentTime to null'
    107  );
    108 }, 'Setting currentTime to null on a CSS transition throws');
    109 
    110 test(t => {
    111  const div = addDiv(t);
    112 
    113  div.style.left = '0px';
    114  getComputedStyle(div).transitionProperty;
    115  div.style.transition = 'left 100s ease-in';
    116  div.style.left = '100px';
    117 
    118  const transition = div.getAnimations()[0];
    119 
    120  // Seek to the middle. Note, this is not equivalent to 50% progress since the
    121  // timing-function is non-linear.
    122  transition.currentTime = 50 * MS_PER_SEC;
    123  const portion = transition.effect.getComputedTiming().progress;
    124 
    125  // Reverse the transition.
    126  div.style.left = '0px';
    127  const reversedTransition = div.getAnimations()[0];
    128 
    129  // If the transition reversing behavior does not advance the previous
    130  // transition to the time set by currentTime, start and end values will both
    131  // be 0px and no transition will be produced.
    132  assert_not_equals(reversedTransition, undefined,
    133                    "A reversed transition is produced");
    134 
    135  const expectedDuration = 100 * MS_PER_SEC * portion;
    136  assert_approx_equals(
    137    reversedTransition.effect.getComputedTiming().activeDuration,
    138    expectedDuration,
    139    1,
    140    "The reversed transition has correctly reduced duration"
    141  );
    142 }, "Transition reversing behavior respects currentTime and uses the " +
    143   "transition's current position.");
    144 
    145 </script>