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-<!DOCTYPE html>
-<title>Tests position fallback with bottom-up scroller</title>
-<link rel="author" href="mailto:xiaochengh@chromium.org">
-<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#scroll">
-<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-apply">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="support/test-common.js"></script>
-
-<style>
-#containing-block {
- width: 400px;
- height: 400px;
- transform: scale(1);
- border: 1px solid black;
-}
-
-#scroller {
- display: flex;
- flex-direction: column-reverse;
- width: 400px;
- height: 400px;
- overflow-y: scroll;
-}
-
-.box {
- min-height: 100px;
- width: 100px;
-}
-
-#anchor {
- anchor-name: --a;
- background: orange;
-}
-
-#anchored {
- position: absolute;
- width: 100px;
- height: 100px;
- background: green;
- anchor-default: --a;
- position-fallback: --pf;
-}
-
-@position-fallback --pf {
- @try { top: anchor(--a bottom); }
- @try { bottom: anchor(--a top); }
-}
-</style>
-
-<div id="containing-block">
- <div id="scroller">
- <div class="box"></div>
- <div class="box" id="anchor"></div>
- <div class="box"></div>
- <div class="box"></div>
- <div class="box"></div>
- </div>
- <div id="anchored"></div>
-</div>
-
-<script>
-promise_test(async () => {
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'bottom');
-}, 'Should use the first fallback position at the initial scroll offset');
-
-promise_test(async () => {
- scroller.scrollTop = -1;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'top');
-}, 'Should use the second fallback position after scrolling up');
-</script>