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<!DOCTYPE html>
<html class=reftest-wait>
<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#dom-layoutconstraints-data">
<link rel="match" href="green-square-ref.html">
<meta name="assert" content="This test checks that passing data to a child layout works correctly." />
<style>
.test {
background: red;
width: 100px;
}
@supports (display: layout(parent)) {
.test {
display: layout(parent);
background: green;
}
.child {
display: layout(child);
}
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>
<div class="test">
<div class="child"></div>
</div>
<script id="code" type="text/worklet">
const DATA = {
str: 'hello',
num: 42,
obj: {str2: 'world'},
};
registerLayout('parent', class {
async intrinsicSizes() {}
async layout([child], edges, constraints, styleMap) {
const childFragment = await child.layoutNextFragment({data: DATA});
// If the child's block-size is 100 the structured cloning worked.
if (childFragment.blockSize === 100) {
return {autoBlockSize: 100, childFragments: [childFragment]};
}
return {autoBlockSize: 0, childFragments: [childFragment]};
}
});
registerLayout('child', class {
async intrinsicSizes() {}
async layout(children, edges, constraints, styleMap) {
// Use JSON.stringify to make sure the structured cloning worked.
if (constraints.data !== DATA &&
JSON.stringify(constraints.data) === JSON.stringify(DATA)) {
return {autoBlockSize: 100};
}
return {autoBlockSize: 0};
}
});
</script>
<script>
importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, document.getElementById('code').textContent);
</script>
</html>
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