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<!DOCTYPE html>
<meta charset="utf-8">
<title>Last remembered size</title>
<link rel="author" title="Jihye Hong" href="mailto:jihye@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#last-remembered">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#intrinsic-size-override">
<link rel="help" href="https://drafts.csswg.org/css-contain-2/#content-visibility">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/8407">
<meta name="assert" content="Tests that content-visibility: auto forces contain-intrinsic-size to gain an auto value." />
<style>
#t1 {
position: absolute;
left: 0vmax;
content-visibility: auto;
contain-intrinsic-size: 1000vmax 1000vmax;
background: red;
}
#t1::before {
content: "";
display: block;
width: 10px;
height: 10px;
}
</style>
<div id="t1"></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function nextRendering() {
return new Promise(resolve => {
requestAnimationFrame(() => requestAnimationFrame(() => resolve()));
});
}
promise_test(async () => {
// Size normally.
await nextRendering();
assert_equals(t1.clientWidth, 10, "Sizing normally: clientWidth");
assert_equals(t1.clientHeight, 10, "Sizing normally: clientHeight");
await nextRendering();
// Move off-screen the target. Same size as in previous step!
t1.style.left = "-200vmax";
assert_true(window.getComputedStyle(t1).containIntrinsicSize.includes("auto"), "containIntrinsicSize should be adjusted to auto");
await nextRendering();
assert_equals(t1.clientWidth, 10, "Sizing with new last remembered size: clientWidth");
assert_equals(t1.clientHeight, 10, "Sizing with new last remembered size: clientHeight");
}, 'content-visibility: auto forces contain-intrinsic-size to gain an auto value');
</script>
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