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<!doctype html>
<title>CSS Test: @keyframes applies to :host::before/::after.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://drafts.csswg.org/css-scoping/#shadow-names">
<div id="host"></div>
<script>
test(function() {
host.attachShadow({ mode: "open" }).innerHTML = `
<style>
@keyframes myanim {
from { background: red; }
to { background: green; }
}
:host::before, :host::after {
content: "";
display: block;
width: 100px;
height: 100px;
background: blue;
animation: myanim 10s infinite step-end;
}
</style>
`;
assert_equals(getComputedStyle(document.getElementById('host'), "::before").backgroundColor, "rgb(255, 0, 0)");
assert_equals(getComputedStyle(document.getElementById('host'), "::after").backgroundColor, "rgb(255, 0, 0)");
}, "@keyframes applies to the shadow host");
</script>
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