servo/tests/wpt/css-tests/css-animations-1_dev/html/animation-keyframes-001.htm

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<!DOCTYPE html>
<html><head><meta charset="utf-8">
<title>CSS Animations Test: @keyframes - from, to, percentage</title>
<link href="http://www.nokia.com" rel="author" title="Nokia Inc.">
<link href="http://www.intel.com" rel="author" title="Intel">
<link href="mailto:zhiqiang.zhang@intel.com" rel="reviewer" title="Zhiqiang Zhang"> <!-- 2015-05-06 -->
<link href="https://drafts.csswg.org/css-animations-1/#animation-name" rel="help">
<link href="https://drafts.csswg.org/css-animations-1/#animation-duration" rel="help">
<link href="https://drafts.csswg.org/css-animations-1/#keyframes" rel="help">
<meta content="animated" name="flags">
<meta content="Check that @keyframes rule accepts 'from' and 'to'
keywords, and percentage values." name="assert">
<style>
div {
animation-name: sample;
animation-duration: 10s;
background-color: blue;
height: 100px;
width: 100px;
}
@keyframes sample {
from {
background-color: blue;
}
30% {
background-color: green;
}
65% {
background-color: yellow;
}
to {
background-color: blue;
}
}
</style>
</head><body>
<p>
Test passes if there is a filled blue square with 'Filler Text'
initially on page load, and if the color of the square gradully changes
in order: BLUE to GREEN to YELLOW and back to BLUE in 10 seconds.
</p>
<div>Filler Text</div>
</body></html>