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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-conditional/container-queries/scroll-state/scroll-state-stuck-pseudo.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>@container: scroll-state(stuck) for pseudo element</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-conditional/container-queries/support/cq-testcommon.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
#scroller {
overflow-y: scroll;
height: 200px;
}
#filler {
height: 100px;
}
#stuck {
#inner {
height: 50px;
}
container-type: scroll-state;
position: sticky;
bottom: 0;
--before: no;
--after: no;
@container scroll-state(stuck: bottom) {
&::before {
--before: yes;
content: " ";
}
&::after {
--after: yes;
}
}
}
</style>
<div id="scroller">
<div id="filler"></div>
<div id="stuck">
<div id="inner"></div>
</div>
</div>
<script>
setup(() => assert_implements_scroll_state_container_queries());
promise_test(async t => {
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(stuck, "::before").getPropertyValue("--before"), "no");
assert_equals(getComputedStyle(stuck, "::after").getPropertyValue("--after"), "no");
}, "Initially, stuck query does not match and ::before/::after do not apply");
promise_test(async t => {
inner.style.height = "150px";
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(stuck, "::before").getPropertyValue("--before"), "yes");
assert_equals(getComputedStyle(stuck, "::after").getPropertyValue("--after"), "yes");
}, "::before/::after depending on stuck query");
</script>