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scroll-state-snapped-snap-changing.html
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<!DOCTYPE html>
<title>@container: scroll-state(snapped) matches for scrollchanging</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-rule">
<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="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.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) {
span { --snapped: true; }
}
</style>
<div id="snapped1" class="snapped">
<span id="target1"></span>
</div>
<div id="snapped2" class="snapped">
<span id="target2"></span>
</div>
<div id="filler"></div>
<script>
setup(() => assert_implements_scroll_state_container_queries());
let changeTarget;
let changingTarget;
window.addEventListener("scrollsnapchange", e => changeTarget = e.snapTargetBlock);
window.addEventListener("scrollsnapchanging", e => changingTarget = e.snapTargetBlock);
promise_test(async t => {
await waitForAnimationFrames(2);
assert_equals(getComputedStyle(target1).getPropertyValue("--snapped"), "true");
assert_equals(getComputedStyle(target2).getPropertyValue("--snapped"), "");
assert_equals(changeTarget, snapped1, "snapchange has been called for #snapped1");
assert_equals(changingTarget, undefined, "snapchanging has not been called");
assert_equals(window.scrollY, 0);
}, "Initially snapped to #snapped1, scroll-state() styling #target1")
promise_test(async t => {
await new test_driver.Actions()
.addPointer("pointer1", "touch")
.pointerMove(0, 200, {origin: "viewport"})
.pointerDown()
.pause(50)
.pointerMove(0, 0, {origin: "viewport"})
.pause(50)
.send();
assert_equals(changeTarget, snapped1, "snapchange has not been called for #snapped2");
assert_equals(changingTarget, snapped2, "snapchanging has been called for #snapped2");
assert_equals(getComputedStyle(target1).getPropertyValue("--snapped"), "",
"#target1 not matching scroll-state(snapped) while scrolling");
assert_equals(getComputedStyle(target2).getPropertyValue("--snapped"), "true",
"#target2 matching scroll-state(snapped) while scrolling");
}, "scroll-state(snapped) matching #snapped2 while scrolling");
</script>