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66 lines
2.1 KiB
HTML
66 lines
2.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>CSS Variables - Animation - From and To Values</title>
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<meta rel="author" title="Kevin Babbitt">
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<meta rel="author" title="Greg Whitworth">
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<link rel="author" title="Microsoft Corporation" href="http://microsoft.com" />
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<link rel="help" href="http://www.w3.org/TR/css-variables-1/#syntax">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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@keyframes valueanim
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{
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to { --value: green; }
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}
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/* Start the animation in the paused state and fill at both ends so we can inspect values from both keyframes. */
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#target
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{
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animation-name: valueanim;
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animation-duration: 1s;
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animation-play-state: paused;
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animation-fill-mode: both;
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}
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#target
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{
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--value: blue;
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}
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#target span
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{
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color: var(--value);
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}
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</style>
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</head>
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<body>
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<div id="target"><span>This text should animate from blue to green over a period of 1 second.</span></div>
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<script type="text/javascript">
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"use strict";
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// Force an initial layout pass
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document.documentElement.offsetHeight;
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test(function() {
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assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(), "blue", "--value is blue before animation runs");
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}, "Verify CSS variable value before animation");
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var animationTest = async_test("Verify CSS variable value after animation");
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animationTest.step(function() {
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// Set event handler
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document.getElementById("target").addEventListener("animationend", animationTest.step_func(function() {
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assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(), "green", "--value is green after animation runs")
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animationTest.done();
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}));
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// Trigger animation
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document.getElementById("target").style.animationPlayState = "running";
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});
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</script>
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</body>
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</html>
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