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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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layout/style/test/test_animations_dynamic_changes.html Normal file
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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=978833
-->
<head>
<title>Test for Bug 978833</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style id="style">
@keyframes a {
from, to {
/* a non-inherited property, so it's cached in the rule tree */
margin-left: 50px;
}
}
.alwaysa {
animation: a linear 1s infinite;
}
</style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=978833">Mozilla Bug 978833</a>
<p id="display"></p>
<pre id="test">
<script type="application/javascript">
var p = document.getElementById("display");
var cs = getComputedStyle(p, "");
var style = document.getElementById("style").sheet;
/** Test for Bug 978833 **/
function test_bug978833() {
var kfs = style.cssRules[0];
var kf = kfs.cssRules[0];
is(kf.style.marginLeft, "50px", "we found the right keyframe rule");
p.classList.add("alwaysa");
is(cs.marginLeft, "50px", "p margin-left should be 50px");
// Temporarily remove the animation style, since we resolve keyframes
// on top of current animation styles (although maybe we shouldn't),
// so we need to remove those styles to hit the rule tree cache.
p.classList.remove("alwaysa");
is(cs.marginLeft, "0px", "p margin-left should be 0px without animation");
p.classList.add("alwaysa");
kf.style.marginLeft = "100px";
is(cs.marginLeft, "100px", "p margin-left should be 100px after change");
// Try the same thing a second time, just to make sure it works again.
p.classList.remove("alwaysa");
is(cs.marginLeft, "0px", "p margin-left should be 0px without animation");
p.classList.add("alwaysa");
kf.style.marginLeft = "150px";
is(cs.marginLeft, "150px", "p margin-left should be 150px after second change");
p.style.animation = "";
}
test_bug978833();
</script>
</pre>
</body>
</html>