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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://github.com/w3c/csswg-drafts/issues/7807">
<meta name="assert" content="Tests that content-visibility:auto, contain:size and contain-intrinsic-size:auto do not result in instable size." />
<style>
#target {
content-visibility: auto;
contain-intrinsic-size: auto 100px auto 101px;
width: max-content;
height: max-content;
border: 1px solid;
}
#target::before {
content: "";
display: block;
width: 50px;
height: 51px;
}
</style>
<div id="log"></div>
<div id="spacer"></div>
<div id="target"></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const target = document.getElementById("target");
const spacer = document.getElementById("spacer");
function checkSize(expectedWidth, expectedHeight, msg) {
test(function() {
assert_equals(target.clientWidth, expectedWidth, "clientWidth");
assert_equals(target.clientHeight, expectedHeight, "clientHeight");
}, msg);
}
function nextRendering() {
return new Promise(resolve => {
requestAnimationFrame(() => requestAnimationFrame(() => resolve()));
});
}
setup({explicit_done: true});
(async function() {
// Size normally.
await nextRendering();
checkSize(50, 51, "Sizing normally");
await nextRendering();
// The last remembered size is 50x51, but the element is not skipping
// its contents, so the fallback size will be used instead.
target.style.contain = "size";
checkSize(100, 101, "Sizing with c-i-s fallback");
await nextRendering();
// The last remembered size is now 100x101, but still not using it.
spacer.style.height = "10000vh";
checkSize(100, 101, "Still sizing with c-i-s fallback");
await nextRendering();
// The element went off-screen, using last remembered size now.
// It's important that this is the same as in previous step!
checkSize(100, 101, "Sizing with last remembered size");
await nextRendering();
// Change the c-i-s fallback to prove last remembered size is used.
target.style.containIntrinsicSize = "auto 150px auto 151px";
checkSize(100, 101, "Still sizing with last remembered size");
// Move the element on-screen. Switch to using c-i-s fallback, and
// update the last remembered size.
spacer.style.height = "0px";
await nextRendering();
checkSize(150, 151, "Sizing with new c-i-s fallback");
await nextRendering();
// Move off-screen again. Same size as in previous step!
spacer.style.height = "10000vh";
await nextRendering();
target.style.containIntrinsicSize = "auto 200px auto 201px";
checkSize(150, 151, "Sizing with new last remembered size");
done();
})();
</script>
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