Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-animations/animation-style-element-replaced-with-keyframes-rule-of-same-name.html - WPT Dashboard Interop Dashboard
<!doctype html>
<meta charset=utf-8>
<title>Changes to @keyframes rules</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<div id="log"></div>
<script>
'use strict';
test(t => {
const div = addDiv(t);
const originalStyleElement = document.createElement("style");
originalStyleElement.textContent = '@keyframes anim-custom { from, to { left: 100px } }';
document.head.appendChild(originalStyleElement);
t.add_cleanup(() => originalStyleElement.remove());
div.style.animation = 'anim-custom 100s';
const computedStyle = getComputedStyle(div);
assert_equals(computedStyle.left, "100px", "The initial @keyframes rule is applied");
// Remove the original style element and add a new one with an animation with the same name.
const newStyleElement = document.createElement("style");
newStyleElement.textContent = '@keyframes anim-custom { from, to { left: 200px } }';
originalStyleElement.replaceWith(newStyleElement);
t.add_cleanup(() => newStyleElement.remove());
assert_equals(computedStyle.left, "200px", "The new @keyframes rule is applied");
}, 'Replacing a <style> element with a new <style> element while both containing the different @keyframes rule with the same name dynamically updates running animations.');
</script>