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<!DOCTYPE html>
<title>Tests 'position-fallback-bounds' should work without default anchor</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback-bounds">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-common.js"></script>
<style>
body {
margin: 0;
}
#bounds {
position: absolute;
left: 0;
right: 0;
top: 100px;
height: calc(100vh + 200px);
background: lightgray;
anchor-name: --bounds;
}
#anchor {
position: fixed;
width: 100px;
height: 100px;
left: 0;
top: 100px;
background: orange;
anchor-name: --a;
}
#target {
position: fixed;
width: 100px;
height: 100px;
background: lime;
position-try-options: --bottom;
position-fallback-bounds: --bounds;
bottom: anchor(--a top);
}
@position-try --bottom {
top: anchor(--a bottom);
bottom: auto;
}
</style>
<div id=bounds></div>
<div id=anchor></div>
<div id=target></div>
<script>
promise_test(async () => {
await waitUntilNextAnimationFrame();
assert_fallback_position(target, anchor, 'bottom');
}, "Target is below anchor at initial scroll position");
promise_test(async () => {
document.documentElement.scrollTop = 100;
await waitUntilNextAnimationFrame();
assert_fallback_position(target, anchor, 'top');
}, "Target moves to above anchor after the additional fallback-bounds rect is scrolled upwards");
</script>
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