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<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width">
<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>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1918906">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#scroll-adjustment">
<style>
html {
scroll-behavior: smooth;
}
#anchor {
height: 100px;
background-color: blue;
}
a {
transition: font-size 0.2s;
font-size: 10px;
}
a:hover {
font-size: 13px;
}
</style>
<a href="#anchor">Go to an anchor</a>
<div style="height: 500vh;"></div>
<div id="anchor"></div>
<div style="height: 100vh;"></div>
<script>
promise_test(async t => {
assert_equals(window.scrollY, 0);
const anchorRect = anchor.getBoundingClientRect();
const scrollEndPromise =
new Promise(resolve => window.addEventListener("scrollend", resolve));
const anchorNode = document.querySelector("a");
test_driver.click(anchorNode);
await scrollEndPromise;
assert_approx_equals(window.scrollY, anchorRect.y, 3);
}, "Ignore scroll position adjustments during smooth scrolling to anchor");
</script>
</html>
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