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<!doctype html>
<title>@container: originating element container for pseudo elements</title>
<link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-queries">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
.container { container-type: inline-size; }
#target { display: list-item; }
#target::before { content: "PASS"; font-size: 10cqw; }
#target::after { font-size: 10cqw; }
#target::marker { font-size: 10cqw; }
#target::first-line { font-size: 10cqw; }
#target::first-letter { font-size: 10cqw; }
#target::highlight(foo) {
text-decoration-line: underline;
text-decoration-thickness: 10cqw;
}
#outer::first-line { font-size: 10cqw; }
#outer::first-letter { font-size: 10cqw; }
dialog::backdrop { font-size: 10cqw; }
</style>
<div style="width: 400px" class="container">
<div style="width: 300px" class="container">
<div id="target" class="container" style="width: 200px">First-line</div>
<dialog id="dialog" class="container" style="width: 100px"></dialog>
</div>
<div style="width: 400px" class="container">
<div id="outer" style="width: 300px" class="container">
<div class="container" style="width: 200px">First-line</div>
</div>
</div>
<script>
setup(() => assert_implements_container_queries());
test(() => {
assert_equals(getComputedStyle(target, "::before").fontSize, "20px");
}, "Originating element container for ::before");
test(() => {
assert_equals(getComputedStyle(target, "::after").fontSize, "20px");
}, "Originating element container for ::after");
test(() => {
assert_equals(getComputedStyle(target, "::marker").fontSize, "20px");
}, "Originating element container for ::marker");
test(() => {
assert_equals(getComputedStyle(target, "::first-line").fontSize, "20px");
}, "Originating element container for ::first-line");
test(() => {
assert_equals(getComputedStyle(target, "::first-letter").fontSize, "20px");
}, "Originating element container for ::first-letter");
test(() => {
assert_equals(getComputedStyle(target, "::highlight(foo)").textDecorationThickness, "20px");
}, `Originating element container for ::highlight`);
test(() => {
assert_equals(getComputedStyle(outer, "::first-line").fontSize, "30px");
}, "Originating element container for outer ::first-line");
test(() => {
assert_equals(getComputedStyle(outer, "::first-letter").fontSize, "30px");
}, "Originating element container for outer ::first-letter");
test((t) => {
t.add_cleanup(() => dialog.close());
assert_equals(getComputedStyle(dialog, "::backdrop").fontSize, "30px", "::backdrop not rendered");
dialog.showModal();
assert_equals(getComputedStyle(dialog, "::backdrop").fontSize, "10px", "::backdrop rendered");
}, "Originating element container for ::backdrop");
</script>
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