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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-scroll-snap/resnap-on-layout-is-immediate.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.scroller {
overflow-y: scroll;
scroll-snap-type: y mandatory;
border: 1px solid black;
width: 400px;
height: 400px;
}
.scroller .box {
scroll-snap-align: start;
scroll-snap-stop: always;
width: 100%;
height: 100%;
}
.changer {
height: 100%;
width: 100%;
background-color: red;
}
body.changed .changer {
height: 0;
}
</style>
<div class="scroller" id="scroller">
<div class="changer"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
</div>
<script>
let scroller = document.getElementById('scroller');
promise_test(async t => {
await new Promise(resolve => step_timeout(resolve, 0));
assert_equals(scroller.scrollTop, 400);
document.body.classList.add('changed');
assert_equals(scroller.scrollTop, 0);
}, "When re-snap happens on layout, the new scroll position should be set immediately");
</script>