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<!DOCTYPE html>
<title>position-area with fallback and scrolling</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, flip-inline, flip-block flip-inline;
width: 50%;
height: 50%;
background: cyan;
}
#container.thicker > .pos {
border-width: thick;
}
</style>
<div id="scrollable" style="position:relative; overflow:hidden; width:500px; height:500px; background:yellow;">
<div style="width:2000px; height:2000px;">
<div id="container">
<div style="anchor-name:--anchor; margin:200px; width:50px; height:50px; background:gray;"></div>
<div id="anchored" style="position-area:top left;"></div>
</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"));
}
async function redisplay(elm) {
elm.style.display = "none";
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
elm.style.display = "block";
}
promise_test(async() => {
// Start at top left.
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 100, 100, 100);
}, "Initial scroll position");
promise_test(async() => {
scrollable.scrollTo(40, 60);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 100, 100, 100);
}, "Scroll to 40,60");
promise_test(async() => {
// Switch to bottom left.
scrollable.scrollTo(100, 150);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 150, 250, 50, 200);
}, "Scroll to 100,150");
promise_test(async() => {
scrollable.scrollTo(0, 0);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 150, 250, 50, 200);
}, "Scroll to 0,0");
promise_test(async() => {
// Switch back to top left.
await redisplay(anchored);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 100, 100, 100);
}, "Redisplay at 0,0");
promise_test(async() => {
// Switch to top right.
scrollable.scrollTo(750, 100);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 250, 150, 500, 50);
}, "Scroll to 750,100");
promise_test(async() => {
// Switch to bottom right.
scrollable.scrollTo(750, 196);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 250, 250, 500, 223);
}, "Scroll to 750,196");
promise_test(async() => {
scrollable.scrollTo(195, 196);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 250, 250, 500, 223);
}, "Scroll to 195,196");
promise_test(async() => {
// Switch to top left.
scrollable.scrollTo(194, 196);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 194, 250, 6, 223);
}, "Scroll to 194,195");
promise_test(async() => {
scrollable.scrollTo(194, 194);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 194, 250, 6, 223);
}, "Scroll to 194,194");
promise_test(async() => {
await redisplay(anchored);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 194, 194, 6, 6);
}, "Redisplay at 194,194");
</script>
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