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<!DOCTYPE html>
<title>position-area with fallback and scrolling, tall anchor</title>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-common.js"></script>
<style>
#anchored {
position: absolute;
box-sizing: border-box;
border: solid;
position-anchor: --anchor;
position-try-fallbacks: flip-block;
width: 50%;
height: 50%;
background: cyan;
}
</style>
<div id="scrollable" style="position:relative; overflow:scroll; scrollbar-width:none; width:500px; height:500px; background:yellow;">
<div style="display: flow-root; width:2000px; height:2000px;">
<div style="anchor-name:--anchor; margin:200px; width:50px; height:1000px; background:gray;"></div>
<div id="anchored" style="position-area:top left;"></div>
</div>
</div>
<script>
function assert_rects_equal(elm, x, y, width, height) {
assert_equals(elm.offsetLeft, x, (elm.id + " x"));
assert_equals(elm.offsetTop, y, (elm.id + " y"));
assert_equals(elm.offsetWidth, width, (elm.id + " width"));
assert_equals(elm.offsetHeight, height, (elm.id + " height"));
}
promise_test(async() => {
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 100, 100, 100);
}, "Initial scroll position");
promise_test(async() => {
// Swich to bottom option.
scrollable.scrollTo(0, 1500);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 1200, 100, 400);
}, "Scroll to the bottom");
promise_test(async() => {
scrollable.scrollTo(0, 500);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 1200, 100, 400);
}, "Scroll to 500");
promise_test(async() => {
scrollable.scrollTo(0, 195);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 1200, 100, 400);
}, "Scroll to 195");
promise_test(async() => {
// Switch to top option.
scrollable.scrollTo(0, 194);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 194, 100, 6);
}, "Scroll to 194");
</script>
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