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<!DOCTYPE html>
<title>@container: scroll-state(snapped) target selector change</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#snapped">
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events">
<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>
html { scroll-snap-type: block mandatory; }
body { margin: 0; }
#filler { height: 10000px; }
#snapped {
container-type: scroll-state;
scroll-snap-align: start;
width: 100px;
height: 100px;
}
@container scroll-state(snapped: block) {
.target { --snapped: true; }
}
</style>
<div id="snapped">
<span id="target"></span>
</div>
<div id="filler"></div>
<script>
setup(() => assert_implements_scroll_state_container_queries());
promise_test(async t => {
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(target).getPropertyValue("--snapped"), "");
assert_equals(window.scrollY, 0);
}, "Initially snapped to #snapped, but scroll-state() is not queried")
promise_test(async t => {
target.className = "target";
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(target).getPropertyValue("--snapped"), "true");
}, "scroll-state(snapped) queried for #snapped after adding class to #target");
</script>
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