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<!doctype html>
<title>CSS Test: 'x-' prefixed pseudo-elements don't parse correctly</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#pseudo-elements">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
p {
color: green;
}
::x-something-nobody-would-think-of, p {
color: red;
}
</style>
<p>Should be green
<script>
test(function() {
let p = document.querySelector('p');
assert_equals(getComputedStyle(p).color, "rgb(0, 128, 0)");
}, "x-prefixed pseudo-elements should make the whole rule invalid")
</script>
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