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<!DOCTYPE html>
<html>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#invoke-a-layout-callback">
<meta name="assert" content="This test checks running the microtask queue for a layout() class won't run the main world's microtask queue." />
<style>
#test {
display: layout(child-layout);
width: 100px;
}
#test > div {
height: 100px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/worklet-reftest.js"></script>
<div id="test">
<div></div>
</div>
<script id="code" type="text/worklet">
registerLayout('child-layout', class {
async intrinsicSizes() {}
async layout([child]) {
const fragment = await child.layoutNextFragment();
return {autoBlockSize: 50, childFragments: [fragment]};
}
});
</script>
<script>
promise_test(async t => {
if (typeof CSS.layoutWorklet === 'undefined') {
throw Error('CSS Layout API not supported.');
}
await importWorklet(CSS.layoutWorklet, document.getElementById('code').textContent);
let resolved = false;
let p = Promise.resolve().then(() => {
resolved = true;
});
assert_false(resolved);
// Running the layout-worklet's microtask queue shouldn't trigger the main
// world's microtask queue.
assert_equals(document.getElementById('test').clientHeight, 50);
assert_false(resolved);
await p;
assert_true(resolved);
});
</script>
</html>
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