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<!DOCTYPE html>
<meta charset="utf-8">
<title>Last remembered size</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@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://drafts.csswg.org/css-contain-3/#containment-inline-size">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/7807">
<meta name="assert" content="Tests that the last remembered size can be updated when the element has size containment but doesn't skip its contents." />
<style>
#target {
width: max-content;
height: max-content;
border: 1px solid;
}
#target::before {
content: "";
display: block;
}
.content-100-50::before {
width: 100px;
height: 50px;
}
.content-skip {
content-visibility: hidden;
}
.contain-size {
contain: size;
}
.contain-inline-size {
contain: inline-size;
}
.ciw-auto-2 {
contain-intrinsic-width: auto 2px;
}
.ciw-auto-20 {
contain-intrinsic-width: auto 20px;
}
.cih-auto-1 {
contain-intrinsic-height: auto 1px;
}
.cih-auto-10 {
contain-intrinsic-height: auto 10px;
}
</style>
<div id="log"></div>
<div id="target"></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const target = document.getElementById("target");
function checkSize(expectedWidth, expectedHeight, msg) {
assert_equals(target.clientWidth, expectedWidth, msg + " - clientWidth");
assert_equals(target.clientHeight, expectedHeight, msg + " - clientHeight");
}
function nextRendering() {
return new Promise(resolve => {
requestAnimationFrame(() => requestAnimationFrame(() => resolve()));
});
}
promise_test(async function() {
target.className = "content-100-50";
checkSize(100, 50, "Sizing normally");
await nextRendering();
target.className = "content-100-50 ciw-auto-20 cih-auto-10 contain-size";
checkSize(20, 10, "Size containment");
await nextRendering();
target.className = "content-skip ciw-auto-2 cih-auto-1";
checkSize(20, 10, "Using last remembered size");
}, "contain:size does not prevent recording last remembered size");
promise_test(async function() {
target.className = "content-100-50";
checkSize(100, 50, "Sizing normally");
await nextRendering();
target.className = "content-100-50 ciw-auto-20 cih-auto-10 contain-inline-size";
checkSize(20, 50, "Size containment for inline axis");
await nextRendering();
target.className = "content-skip ciw-auto-2 cih-auto-1";
checkSize(20, 50, "Using last remembered block size");
}, "contain:inline-size does not prevent recording last remembered inline size");
</script>
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