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<!DOCTYPE html>
<title>position-area to include current scroll position at first layout</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>
.pos {
position: absolute;
box-sizing: border-box;
border: solid;
position-anchor: --anchor;
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;">
<div style="width:1000px; height:1000px;">
<div id="container">
<div style="height:200px;"></div>
<div style="anchor-name:--anchor; margin-left:200px; width:100px; height:100px; background:gray;"></div>
<div id="e1" class="pos" style="position-area:top left;"></div>
<div id="e2" class="pos" style="position-area:top center;"></div>
<div id="e3" class="pos" style="position-area:top right;"></div>
<div id="e4" class="pos" style="position-area:center left;"></div>
<div id="e5" class="pos" style="position-area:center center;"></div>
<div id="e6" class="pos" style="position-area:center right;"></div>
<div id="e7" class="pos" style="position-area:bottom left;"></div>
<div id="e8" class="pos" style="position-area:bottom center;"></div>
<div id="e9" class="pos" style="position-area:bottom right;"></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"));
}
function assert_at_initial() {
assert_rects_equal(e1, 100, 100, 100, 100);
assert_rects_equal(e2, 225, 100, 50, 100);
assert_rects_equal(e3, 300, 100, 100, 100);
assert_rects_equal(e4, 100, 225, 100, 50);
assert_rects_equal(e5, 225, 225, 50, 50);
assert_rects_equal(e6, 300, 225, 100, 50);
assert_rects_equal(e7, 100, 300, 100, 100);
assert_rects_equal(e8, 225, 300, 50, 100);
assert_rects_equal(e9, 300, 300, 100, 100);
}
function assert_at_40_60() {
assert_rects_equal(e1, 120, 130, 80, 70);
assert_rects_equal(e2, 225, 130, 50, 70);
assert_rects_equal(e3, 300, 130, 120, 70);
assert_rects_equal(e4, 120, 225, 80, 50);
assert_rects_equal(e5, 225, 225, 50, 50);
assert_rects_equal(e6, 300, 225, 120, 50);
assert_rects_equal(e7, 120, 300, 80, 130);
assert_rects_equal(e8, 225, 300, 50, 130);
assert_rects_equal(e9, 300, 300, 120, 130);
}
promise_test(async() => {
assert_at_initial();
}, "Initial scroll position");
promise_test(async() => {
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
scrollable.scrollTo(40, 60);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_at_initial();
}, "Scroll to 40,60");
promise_test(async() => {
// As long as we're within the same animation frame (and therefore haven't
// run ResizeObserver events), there will be no anchor recalculation point.
container.style.display = "flow-root";
assert_at_initial();
container.style.display = "none";
document.body.offsetTop;
container.style.display = "block";
assert_at_initial();
}, "Reattach at 40,60");
promise_test(async() => {
container.style.display = "none";
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
container.style.display = "block";
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_at_40_60();
}, "Redisplay at 40,60");
promise_test(async() => {
scrollable.scrollTo(0, 0);
container.className = "thicker";
container.style.display = "block";
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_at_40_60();
}, "Scroll to 0,0 and relayout");
promise_test(async() => {
container.style.display = "none";
await waitUntilNextAnimationFrame();
container.style.display = "block";
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_at_initial();
}, "Redisplay at 0,0");
</script>
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