Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-variables/variable-animation-substitute-within-keyframe-fallback.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<title>CSS Variables - Animation - Substitute Within Keyframe - Fallback</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta rel="author" title="Kevin Babbitt">
<meta rel="author" title="Greg Whitworth">
<meta name="assert" content='The --endColor does the 50% flip and supports the fallback syntax'>
<style>
@keyframes coloranim
{
from { color: blue; }
to { --endColor: var(--nonexistent, green); color: var(--endColor); }
}
/* Start the animation in the paused state and fill at both ends so we can inspect values from both keyframes. */
#target
{
animation-name: coloranim;
animation-duration: 1s;
animation-play-state: paused;
animation-fill-mode: both;
}
#target
{
color: red;
--endColor: red;
}
</style>
</head>
<body>
<div id="target">This text should animate from blue to green over a period of 1 second.</div>
<script type="text/javascript">
"use strict";
// Force an initial layout pass
document.documentElement.offsetHeight;
test(function() {
// Different browsers generate interpolated colors differently, so check multiple valid forms.
assert_in_array(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),
["rgb(0, 0, 255)", "rgba(0, 0, 255, 1)"],
"color is blue before animation runs");
}, "Verify color before animation");
var animationTest = async_test("Verify color after animation");
animationTest.step(function() {
// Set event handler
document.getElementById("target").addEventListener("animationend", animationTest.step_func(function() {
assert_in_array(window.getComputedStyle(document.getElementById("target")).getPropertyValue("color").trim(),
["rgb(0, 128, 0)", "rgba(0, 128, 0, 1)"],
"color is green after animation runs")
animationTest.done();
}));
// Trigger animation
document.getElementById("target").style.animationPlayState = "running";
});
</script>
</body>
</html>