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<!DOCTYPE html>
<title>Tests complex interaction between 'position-fallback-bounds' and scrolling</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;
}
#anchor-scroller {
position: absolute;
height: 175px;
width: 200px;
left: 200px;
top: 100px;
overflow-y: scroll;
z-index: 100;
}
#anchor {
position: absolute;
width: 100px;
height: 100px;
left: 0;
top: 150px;
background-color: orange;
anchor-name: --a;
}
#bounds-scroller {
position: absolute;
width: 400px;
height: 400px;
left: 100px;
top: 0;
overflow-y: scroll;
}
#bounds {
position: absolute;
width: 400px;
height: 400px;
top: 100px;
background: gray;
anchor-name: --bounds;
}
#target {
position: fixed;
width: 100px;
height: 100px;
background-color: lime;
left: anchor(left);
anchor-default: --a;
position-fallback-bounds: --bounds;
position-fallback: --top-then-bottom;
}
@position-fallback --top-then-bottom {
@try { bottom: anchor(top); }
@try { top: anchor(bottom); }
}
</style>
<div id="anchor-scroller">
<div id="anchor"></div>
</div>
<div id="bounds-scroller">
<div id="bounds"></div>
</div>
<div id="target"></div>
<script>
promise_test(async () => {
await waitUntilNextAnimationFrame();
assert_fallback_position(target, anchor, 'top');
}, 'Target is above anchor at initial scroll position');
promise_test(async () => {
const anchorScroller = document.getElementById('anchor-scroller');
anchorScroller.scrollTop = 100;
await waitUntilNextAnimationFrame();
assert_fallback_position(target, anchor, 'bottom');
}, 'Target falls back to below anchor after anchor is scrolled upwards');
promise_test(async () => {
const boundsScroller = document.getElementById('bounds-scroller');
boundsScroller.scrollTop = 100;
await waitUntilNextAnimationFrame();
assert_fallback_position(target, anchor, 'top');
}, 'Target returns to above anchor after bounds are scrolled upwards');
</script>
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