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-<!DOCTYPE html>
-<title>Tests basic 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 {
- position: relative;
- width: 200vw;
- height: 200vh;
-}
-
-#bounds {
- position: fixed;
- inset: 50px;
- background: gray;
- opacity: 0.1;
- z-index: -1;
- anchor-name: --bounds;
-}
-
-#anchor {
- position: absolute;
- width: 100px;
- height: 100px;
- left: 200px;
- top: 200px;
- background-color: orange;
- anchor-name: --a;
-}
-
-#target {
- position: fixed;
- width: 100px;
- height: 100px;
- background-color: lime;
- anchor-default: --a;
- position-fallback-bounds: --bounds;
- position-try-options: --corner1, --corner2, --corner3;
- bottom: anchor(top);
- right: anchor(left);
-}
-
-@position-try --corner1 {
- inset: auto;
- top: anchor(bottom);
- right: anchor(left);
-}
-@position-try --corner2 {
- inset: auto;
- bottom: anchor(top);
- left: anchor(right);
-}
-@position-try --corner3 {
- inset: auto;
- top: anchor(bottom);
- left: anchor(right);
-}
-</style>
-
-<div id="bounds"></div>
-<div id="anchor"></div>
-<div id="target"></div>
-
-<script>
-promise_test(async () => {
- await waitUntilNextAnimationFrame();
- assert_fallback_position(target, anchor, 'top');
- assert_fallback_position(target, anchor, 'left');
-}, "Target is at anchor's top-left corner at initial scroll position");
-
-promise_test(async () => {
- document.documentElement.scrollTop = 100;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(target, anchor, 'bottom');
- assert_fallback_position(target, anchor, 'left');
-}, "Target falls back to anchor's bottom-left corner after anchor is scrolled upwards");
-
-promise_test(async () => {
- document.documentElement.scrollLeft = 100;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(target, anchor, 'bottom');
- assert_fallback_position(target, anchor, 'right');
-}, "Target falls back to anchor's bottom-right corner after anchor is further scrolled leftwards");
-
-promise_test(async () => {
- document.documentElement.scrollTop = 0;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(target, anchor, 'top');
- assert_fallback_position(target, anchor, 'right');
-}, "Target falls back to anchor's top-left corner after anchor is scrolled back downwards");
-</script>