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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-try-options: --bottom;
- bottom: anchor(top);
-}
-
-@position-try --bottom {
- top: anchor(bottom);
- bottom: auto;
-}
-</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>