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<!doctype html>
<meta charset=utf-8>
<title>CSSTransition.ready</title>
<!-- TODO: Add a more specific link for this once it is specified. -->
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#csstransition">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/helper.js"></script>
<div id="log"></div>
<script>
'use strict';
promise_test(async t => {
const div = addDiv(t);
// Set up pending transition
div.style.transform = 'translate(0px)';
getComputedStyle(div).transform;
div.style.transition = 'transform 100s';
div.style.transform = 'translate(10px)';
getComputedStyle(div).transform;
const animation = div.getAnimations()[0];
assert_true(animation.pending, 'Animation is initially pending');
const readyPromise = animation.ready;
// Now remove transform from transition-property and flush styles
div.style.transitionProperty = 'none';
getComputedStyle(div).transitionProperty;
try {
await readyPromise;
assert_unreached('ready promise was fulfilled');
} catch (err) {
assert_equals(err.name, 'AbortError',
'ready promise is rejected with AbortError');
assert_equals(animation.playState, 'idle',
'Animation is idle after transition was canceled');
}
}, 'ready promise is rejected when a transition is canceled by updating'
+ ' transition-property');
promise_test(async t => {
const div = addDiv(t);
// Set up pending transition
div.style.marginLeft = '0px';
getComputedStyle(div).marginLeft;
div.style.transition = 'margin-left 100s';
div.style.marginLeft = '100px';
getComputedStyle(div).marginLeft;
const animation = div.getAnimations()[0];
assert_true(animation.pending, 'Animation is initially pending');
const readyPromise = animation.ready;
// Update the transition to animate to something not-interpolable
div.style.marginLeft = 'auto';
getComputedStyle(div).marginLeft;
try {
await readyPromise;
assert_unreached('ready promise was fulfilled');
} catch (err) {
assert_equals(err.name, 'AbortError',
'ready promise is rejected with AbortError');
assert_equals(animation.playState, 'idle',
'Animation is idle after transition was canceled');
}
}, 'ready promise is rejected when a transition is canceled by changing'
+ ' the transition property to something not interpolable');
</script>
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