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-<!DOCTYPE html>
-<title>Tests position fallback with initially out-of-viewport anchor</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>
-body {
- margin: 0;
- width: 200vw;
- height: 200vh;
-}
-
-#anchor {
- anchor-name: --a;
- width: 100px;
- height: 100px;
- margin-block-start: 100vb;
- margin-inline-start: 100vi;
- background: orange;
-}
-
-#anchored {
- position: fixed;
- width: 100px;
- height: 100px;
- background: green;
- anchor-default: --a;
- position-fallback: --pf;
-}
-
-@position-fallback --pf {
- @try {
- inset-block-start: anchor(--a end);
- inset-inline-start: anchor(--a end);
- }
- @try {
- inset-block-end: anchor(--a start);
- inset-inline-start: anchor(--a end);
- }
- @try {
- inset-block-start: anchor(--a end);
- inset-inline-end: anchor(--a start);
- }
- @try {
- inset-block-end: anchor(--a start);
- inset-inline-end: anchor(--a start);
- }
-}
-</style>
-
-<div id="anchor"></div>
-<div id="anchored"></div>
-
-<script>
-promise_test(async () => {
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'top');
- assert_fallback_position(anchored, anchor, 'left');
-}, 'Should use the last fallback position initially');
-
-promise_test(async () => {
- // Scroll down to have enough space below the anchor, but not enough right.
- document.documentElement.scrollTop = 250;
- document.documentElement.scrollLeft = 150;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'bottom');
- assert_fallback_position(anchored, anchor, 'left');
-}, 'Should use the third fallback position with enough space below');
-
-promise_test(async () => {
- // Scroll right to have enough space right to the anchor, but not enough below.
- document.documentElement.scrollTop = 150;
- document.documentElement.scrollLeft = 250;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'top');
- assert_fallback_position(anchored, anchor, 'right');
-}, 'Should use the second fallback position with enough space right');
-
-promise_test(async () => {
- // Scroll down and right to have enough space on both axes.
- document.documentElement.scrollTop = 250;
- document.documentElement.scrollLeft = 250;
- await waitUntilNextAnimationFrame();
- assert_fallback_position(anchored, anchor, 'bottom');
- assert_fallback_position(anchored, anchor, 'right');
-}, 'Should use the first fallback position with enough space below and right');
-</script>