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<!doctype html>
<title>CSS Container Queries Test: Style container for pseudo elements</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#query-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
#c1 {
--theme: green;
}
@container style(--theme: green) {
#c1::before {
content: "";
color: green;
display: block;
height: 100px;
}
}
</style>
<div id="c1"></div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
let style = getComputedStyle(c1, "::before");
assert_equals(style.color, "rgb(0, 128, 0)");
assert_equals(style.height, "100px");
}, "::before pseudo element querying style() of originating element");
</script>
<style>
#c2 {
--theme: red;
}
#c2::before { color: red }
#c2.green {
--theme: green;
}
@container style(--theme: green) {
#c2::before {
content: "";
color: green;
}
}
</style>
<div id="c2"></div>
<script>
test(() => {
let style = getComputedStyle(c2, "::before");
assert_equals(style.color, "rgb(255, 0, 0)");
}, "::before pseudo element not matching style()");
test(() => {
c2.className = "green";
let style = getComputedStyle(c2, "::before");
assert_equals(style.color, "rgb(0, 128, 0)");
}, "::before pseudo element matching style() query after class change");
</script>
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