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<!doctype html>
<meta charset=utf-8>
<title>AnimationEffect.getKeyframes() for CSS transitions of the width and height properties</title>
<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>
<style>
.animated-div {
width: 100px;
height: 100px;
}
</style>
<div id="log"></div>
<script>
'use strict';
test(t => {
const div = addDiv(t, { class: 'animated-div' });
div.style.transition = 'width 10s';
getComputedStyle(div).width;
div.style.width = '200px';
const keyframes = div.getAnimations()[0].effect.getKeyframes();
assert_equals(keyframes[0].width, "100px", 'from keyframe value');
assert_equals(keyframes[1].width, "200px", 'to keyframe value');
}, 'getKeyframes() output for a width transition');
test(t => {
const div = addDiv(t, { class: 'animated-div' });
div.style.transition = 'height 10s';
getComputedStyle(div).height;
div.style.height = '200px';
const keyframes = div.getAnimations()[0].effect.getKeyframes();
assert_equals(keyframes[0].height, "100px", 'from keyframe value');
assert_equals(keyframes[1].height, "200px", 'to keyframe value');
}, 'getKeyframes() output for a height transition');
</script>
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