wpt/css/css-backgrounds/animations/border-width-transition-with-style-change.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Transitions Test: border-width transitions when border-style changes from none</title>
<meta name="assert" content="border-width should transition smoothly when
border-style simultaneously changes from none to solid">
<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#the-border-width">
<link rel="help" href="https://www.w3.org/TR/css-transitions/#starting">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>

</head>
<body>
<div id="log"></div>
<script>
// Tests that border-width transitions when border-style simultaneously changes
// from none to solid. The computed value of border-width is independent of
// border-style, so the transition should detect the value change and start.

promise_test(async t => {
  const div = addDiv(t, {
    style: 'border-style: none; border-width: 30px; ' +
           'transition: border-width 3s linear',
  });
  div.computedStyleMap().get('border-top-width');

  div.style.borderStyle = 'solid';
  div.style.borderWidth = '0px';

  const animations = div.getAnimations();
  assert_equals(animations.length, 4,
    'Should have 4 transitions (one per side)');

  await Promise.all(animations.map(a => a.ready));

  for (const a of animations) {
    a.currentTime = 0;
  }
  assert_equals(
    div.computedStyleMap().get('border-top-width').toString(),
    '30px',
    'border-width at 0s'
  );

  for (const a of animations) {
    a.currentTime = 1000;
  }
  assert_equals(
    div.computedStyleMap().get('border-top-width').toString(),
    '20px',
    'border-width at 1s'
  );

  for (const a of animations) {
    a.currentTime = 2000;
  }
  assert_equals(
    div.computedStyleMap().get('border-top-width').toString(),
    '10px',
    'border-width at 2s'
  );

  for (const a of animations) {
    a.currentTime = 3000;
  }
  assert_equals(
    div.computedStyleMap().get('border-top-width').toString(),
    '0px',
    'border-width at 3s'
  );
}, 'border-width transitions from 30px none to 0px solid');
</script>

</body>
</html>