wpt/css/css-variables/variable-animation-from-to.html at master · web-platform-tests/wpt · GitHub

Name: wpt/css/css-variables/variable-animation-from-to.html at master · web-platform-tests/wpt · GitHub
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<!DOCTYPE html>
<html>
<head>
<title>CSS Variables - Animation - From and To Values</title>
<metarel="author" title="Kevin Babbitt">
<metarel="author" title="Greg Whitworth">
<linkrel="author" title="Microsoft Corporation" href="http://microsoft.com" />
<linkrel="help" href="http://www.w3.org/TR/css-variables-1/#syntax">

<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/resources/testharnessreport.js"></script>
<style>
@keyframes valueanim
 {
from { --value: blue; }
to { --value: green; }
 }

/* Start the animation in the paused state and fill at both ends so we can inspect values from both keyframes. */
#target
 {
animation-name: valueanim;
animation-duration:1s;
animation-play-state: paused;
animation-fill-mode: both;
--value: red;
color:var(--value);
 }
</style>
</head>
<body>

<divid="target">This text should animate from blue to green over a period of 1 second.</div>

<scripttype="text/javascript">
"use strict";

// Force an initial layout pass
document.documentElement.offsetHeight;

test(function(){
assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(),"blue","--value is blue before animation runs");
},"Verify CSS variable value before animation");

test(function(){
assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),"rgb(0, 0, 255)","color is blue before animation runs");
},"Verify substituted color value before animation");

varafterAnimationVariableTest=async_test("Verify CSS variable value after animation");
document.getElementById("target").addEventListener("animationend",afterAnimationVariableTest.step_func_done(function(){
assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("--value").trim(),"green","--value is green after animation runs")
}));

varafterAnimationColorTest=async_test("Verify substituted color value after animation");
document.getElementById("target").addEventListener("animationend",afterAnimationColorTest.step_func_done(function(){
assert_equals(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),"rgb(0, 128, 0)","color is green after animation runs")
}));

// Trigger animation
document.getElementById("target").style.animationPlayState="running";
</script>

</body>
</html>