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Element-getAnimations-dynamic-changes.tentative.html
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<!doctype html>
<meta charset=utf-8>
<title>
Element.getAnimations() - Dynamic changes to the list of CSS animations
</title>
<!-- TODO: Add a more specific link for this once it is specified. -->
<link rel="help" href="https://drafts.csswg.org/css-animations-2/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes anim1 {
to { left: 100px }
}
@keyframes anim2 { }
</style>
<body>
<div id="log"></div>
<script>
'use strict';
promise_test(async t => {
const div = addDiv(t);
div.style.animation = 'anim1 100s';
const originalAnimation = div.getAnimations()[0];
// Wait a moment so we can confirm the startTime doesn't change (and doesn't
// simply reflect the current time).
await originalAnimation.ready;
const originalStartTime = originalAnimation.startTime;
const originalCurrentTime = originalAnimation.currentTime;
// Wait a moment so we can confirm the startTime doesn't change (and
// doesn't simply reflect the current time).
await waitForNextFrame();
div.style.animationDuration = '200s';
const animation = div.getAnimations()[0];
assert_equals(animation, originalAnimation,
'The same Animation is returned after updating'
+ ' animation duration');
assert_equals(animation.startTime, originalStartTime,
'Animations returned by getAnimations preserve'
+ ' their startTime even when they are updated');
// Sanity check
assert_not_equals(animation.currentTime, originalCurrentTime,
'Animation.currentTime has updated in next'
+ ' requestAnimationFrame callback');
}, 'Animations preserve their startTime when changed');
test(t => {
const div = addDiv(t);
div.style.animation = 'anim1 100s, anim1 100s';
// Store original state
let animations = div.getAnimations();
const animation1 = animations[0];
const animation2 = animations[1];
// Update first in list
div.style.animationDuration = '200s, 100s';
animations = div.getAnimations();
assert_equals(animations[0], animation1,
'First Animation is in same position after update');
assert_equals(animations[1], animation2,
'Second Animation is in same position after update');
}, 'Updated Animations maintain their order in the list');
promise_test(async t => {
const div = addDiv(t);
div.style.animation = 'anim1 200s, anim1 100s';
// Store original state
let animations = div.getAnimations();
const animation1 = animations[0];
const animation2 = animations[1];
// Wait before continuing so we can compare start times (otherwise the
// new Animation objects and existing Animation objects will all have the same
// start time).
await waitForAllAnimations(animations);
await waitForFrame();
// Swap duration of first and second in list and prepend animation at the
// same time
div.style.animation = 'anim1 100s, anim1 100s, anim1 200s';
animations = div.getAnimations();
assert_true(animations[0] !== animation1 && animations[0] !== animation2,
'New Animation is prepended to start of list');
assert_equals(animations[1], animation1,
'First animation is in second position after update');
assert_equals(animations[2], animation2,
'Second animation is in third position after update');
assert_equals(animations[1].startTime, animations[2].startTime,
'Old animations have the same start time');
assert_equals(animations[0].startTime, null,
'New animation has a null start time');
await animations[0].ready;
assert_greater_than(animations[0].startTime, animations[1].startTime,
'New animation has later start time');
}, 'Only the startTimes of existing animations are preserved');
promise_test(async t => {
const div = addDiv(t);
div.style.animation = 'anim1 100s, anim1 100s';
const secondAnimation = div.getAnimations()[1];
// Wait before continuing so we can compare start times
await secondAnimation.ready;
await waitForNextFrame();
// Trim list of animations
div.style.animationName = 'anim1';
const animations = div.getAnimations();
assert_equals(animations.length, 1, 'List of Animations was trimmed');
assert_equals(animations[0], secondAnimation,
'Remaining Animation is the second one in the list');
assert_equals(typeof(animations[0].startTime), 'number',
'Remaining Animation has resolved startTime');
assert_less_than(animations[0].startTime,
animations[0].timeline.currentTime,
'Remaining Animation preserves startTime');
}, 'Animations are removed from the start of the list while preserving'
+ ' the state of existing Animations');
promise_test(async t => {
const div = addDiv(t);
div.style.animation = 'anim1 100s';
const firstAddedAnimation = div.getAnimations()[0];
// Wait and add second Animation
await firstAddedAnimation.ready;
await waitForFrame();
div.style.animation = 'anim1 100s, anim1 100s';
const secondAddedAnimation = div.getAnimations()[0];
// Wait again and add another Animation
await secondAddedAnimation.ready;
await waitForFrame();
div.style.animation = 'anim1 100s, anim2 100s, anim1 100s';
const animations = div.getAnimations();
assert_not_equals(firstAddedAnimation, secondAddedAnimation,
'New Animations are added to start of the list');
assert_equals(animations[0], secondAddedAnimation,
'Second Animation remains in same position after'
+ ' interleaving');
assert_equals(animations[2], firstAddedAnimation,
'First Animation remains in same position after'
+ ' interleaving');
await animations[1].ready;
assert_greater_than(animations[1].startTime, animations[0].startTime,
'Interleaved animation starts later than existing ' +
'animations');
assert_greater_than(animations[0].startTime, animations[2].startTime,
'Original animations retain their start time');
}, 'Animation state is preserved when interleaving animations in list');
</script>
</body>