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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-snapped-pseudo.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>@container: scroll-state(snapped) layout change</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>
:root {
scroll-snap-type: block proximity;
}
body {
margin: 0;
}
#filler-before {
height: 10px;
}
#filler-after {
height: 10000px;
}
#snapped {
position: relative;
top: 3000px; /* Should be enough to not snap for proximity */
container-type: scroll-state inline-size;
scroll-snap-align: start;
--before: no;
--after: no;
@container scroll-state(snapped) {
&::before {
--before: yes;
content: " ";
}
&::after {
--after: yes;
}
}
}
</style>
<div id="filler-before"></div>
<div id="snapped"></div>
<div id="filler-after"></div>
<script>
setup(() => {
assert_implements_scroll_state_container_queries();
assert_implements_size_container_queries();
});
promise_test(async t => {
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(snapped, "::before").getPropertyValue("--before"), "no");
assert_equals(getComputedStyle(snapped, "::after").getPropertyValue("--after"), "no");
}, "Initially, snapped query does not match and ::before/::after do not apply");
promise_test(async t => {
snapped.style.top = "auto";
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(snapped, "::before").getPropertyValue("--before"), "yes");
assert_equals(getComputedStyle(snapped, "::after").getPropertyValue("--after"), "yes");
}, "::before/::after depending on snapped query");
</script>