effect-value-context.html

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This WPT test may be referenced by the following Test IDs:
- /web-animations/animation-model/keyframe-effects/effect-value-context.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>The effect value of a keyframe effect: Property values that depend on

  their context (target element)</title>

<link rel="help" href="https://drafts.csswg.org/web-animations/#calculating-computed-keyframes">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="../../testcommon.js"></script>

<body>

<div id="log"></div>

<script>

'use strict';

test(t => {

  const div = createDiv(t);

  div.style.fontSize = '10px';

  const animation = div.animate([ { marginLeft: '10em' },

                                  { marginLeft: '20em' } ], 1000);

  animation.currentTime = 500;

  assert_equals(getComputedStyle(div).marginLeft, '150px',

                'Effect value before updating font-size');

  div.style.fontSize = '20px';

  assert_equals(getComputedStyle(div).marginLeft, '300px',

                'Effect value after updating font-size');

}, 'Effect values reflect changes to font-size on element');

test(t => {

  const parentDiv = createDiv(t);

  const div = createDiv(t);

  parentDiv.appendChild(div);

  parentDiv.style.fontSize = '10px';

  const animation = div.animate([ { marginLeft: '10em' },

                                  { marginLeft: '20em' } ], 1000);

  animation.currentTime = 500;

  assert_equals(getComputedStyle(div).marginLeft, '150px',

                'Effect value before updating font-size on parent element');

  parentDiv.style.fontSize = '20px';

  assert_equals(getComputedStyle(div).marginLeft, '300px',

                'Effect value after updating font-size on parent element');

}, 'Effect values reflect changes to font-size on parent element');

promise_test(t => {

  const parentDiv = createDiv(t);

  const div = createDiv(t);

  parentDiv.appendChild(div);

  parentDiv.style.fontSize = '10px';

  const animation = div.animate([ { marginLeft: '10em' },

                                  { marginLeft: '20em' } ], 1000);

  animation.pause();

  animation.currentTime = 500;

  parentDiv.style.fontSize = '20px';

  return animation.ready.then(() => {

    assert_equals(getComputedStyle(div).marginLeft, '300px',

                  'Effect value after updating font-size on parent element');

});

}, 'Effect values reflect changes to font-size when computed style is not'

   + ' immediately flushed');

promise_test(t => {

  const divWith10pxFontSize = createDiv(t);

  divWith10pxFontSize.style.fontSize = '10px';

  const divWith20pxFontSize = createDiv(t);

  divWith20pxFontSize.style.fontSize = '20px';

  const div = createDiv(t);

  div.remove(); // Detach

  const animation = div.animate([ { marginLeft: '10em' },

                                  { marginLeft: '20em' } ], 1000);

  animation.pause();

  return animation.ready.then(() => {

    animation.currentTime = 500;

    divWith10pxFontSize.appendChild(div);

    assert_equals(getComputedStyle(div).marginLeft, '150px',

                  'Effect value after attaching to font-size:10px parent');

    divWith20pxFontSize.appendChild(div);

    assert_equals(getComputedStyle(div).marginLeft, '300px',

                  'Effect value after attaching to font-size:20px parent');

});

}, 'Effect values reflect changes to font-size from reparenting');

test(t => {

  const divA = createDiv(t);

  divA.style.fontSize = '10px';

  const divB = createDiv(t);

  divB.style.fontSize = '20px';

  const animation = divA.animate([ { marginLeft: '10em' },

                                   { marginLeft: '20em' } ], 1000);

  animation.currentTime = 500;

  assert_equals(getComputedStyle(divA).marginLeft, '150px',

                'Effect value before updating target element');

  animation.effect.target = divB;

  assert_equals(getComputedStyle(divB).marginLeft, '300px',

                'Effect value after updating target element');

}, 'Effect values reflect changes to target element');

</script>

</body>