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-<!DOCTYPE html>
-<title>Tests position fallback with initially out-of-viewport anchor in columb-reverse flexbox</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>
-.flex {
- display: flex;
- flex-direction: column-reverse;
-}
-
-#container {
- transform: scale(1);
- width: fit-content;
- height: fit-content;
- margin: 100px;
-}
-
-#scroller {
- width: 400px;
- height: 400px;
- overflow: scroll;
-}
-
-#scroll-content {
- min-width: 800px;
- min-height: 800px;
-}
-
-#anchor {
- anchor-name: --a;
- width: 100px;
- height: 100px;
- margin-bottom: 400px;
- margin-inline-start: 400px;
- background: orange;
-}
-
-#anchored {
- position: absolute;
- width: 100px;
- height: 100px;
- background: green;
- anchor-default: --a;
- position-fallback: --pf;
-}
-
-@position-fallback --pf {
- @try {
- bottom: anchor(--a top);
- left: anchor(--a right);
- }
- @try {
- top: anchor(--a bottom);
- left: anchor(--a right);
- }
- @try {
- bottom: anchor(--a top);
- right: anchor(--a left);
- }
- @try {
- top: anchor(--a bottom);
- right: anchor(--a left);
- }
-}
-</style>
-
-<!-- Use flex column-reverse to make everything bottom-up -->
-<div id="container" class="flex">
- <div id="scroller" class="flex">
- <div id="scroll-content" class="flex">
- <div id="anchor" class="flex"></div>
- </div>
- </div>
- <div id="anchored" class="flex"></div>
-</div>
-
-<script>
-promise_test(async () => {
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'bottom');
- assert_fallback_position(anchored, anchor, 'left');
-}, 'Should use the last fallback position initially');
-
-promise_test(async () => {
- // Scroll up to have enough space above the anchor, but not enough right.
- scroller.scrollTop = -250;
- scroller.scrollLeft = 150;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'top');
- assert_fallback_position(anchored, anchor, 'left');
-}, 'Should use the third fallback position with enough space above');
-
-promise_test(async () => {
- // Scroll right to have enough space right to the anchor, but not enough above.
- scroller.scrollTop = -150;
- scroller.scrollLeft = 250;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'bottom');
- assert_fallback_position(anchored, anchor, 'right');
-}, 'Should use the second fallback position with enough space right');
-
-promise_test(async () => {
- // Scroll up and right to have enough space on both axes.
- scroller.scrollTop = -250;
- scroller.scrollLeft = 250;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'top');
- assert_fallback_position(anchored, anchor, 'right');
-}, 'Should use the first fallback position with enough space above and right');
-</script>