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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { height: 1000px }
div { height: 100px }
</style>
<div id="block1">abc</div>
<div id="block2">def</div>
<script>
// This test verifies that reading window.scrollY forces any pending scroll
// anchoring adjustment to occur before computing the return value.
async_test((t) => {
scrollTo(0, 150);
requestAnimationFrame(() => {
step_timeout(() => {
// Queue scroll anchoring adjustment.
document.querySelector("#block1").style.height = "200px";
// Reading scrollY should force both the layout and the adjustment to
// occur synchronously.
var y = scrollY;
assert_equals(y, 250);
t.done();
}, 0);
});
}, 'Reading scroll position forces scroll anchoring adjustment.');
</script>
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