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<!doctype HTML>
<html id=html>
<meta charset="utf8">
<title>Content Visibility: scroll position restoration</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<meta name="assert" content="if an scroller is hidden via content-visibility and then shown again, its scroll offset should be restored">
<meta name="viewport" content="width=device-width">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/helper.js"></script>
<style>
.scroller {
width: 100px;
height: 500px;
overflow-y: scroll;
}
.spacer { height: 3000px; }
.hidden { content-visibility: hidden; }
</style>
<div id=target class=scroller>
<div class=spacer></div>
</div>
</style>
<script>
function removeHiddenAndScheduleTest(t) {
target.classList.remove("hidden");
requestAnimationFrame(() => {
requestAnimationFrame(() => {
testScrollTop(t);
});
});
}
function testScrollTop(t) {
t.step(() => assert_equals(target.scrollTop, 2000));
t.done();
}
async_test((t) => {
target.scrollTop = 2000;
target.classList.add("hidden");
requestAnimationFrame(() => {
requestAnimationFrame(() => {
removeHiddenAndScheduleTest(t);
});
});
}, "Scroll offset is restored when content-visibility hidden is removed");
</script>
</html>
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