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<!doctype html>
<meta charset=utf-8>
<title>Changes to @keyframes rules</title>
<link rel="help" href="https://drafts.csswg.org/css-animations-1/">
<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>
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