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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-layout-api/fragment-data-function-failure.https.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html class=reftest-wait>
<link rel="match" href="green-square-ref.html">
<meta name="assert" content="This test checks that passing something that can't be serialized to the parent triggers a fallback to block layout." />
<style>
.test {
background: red;
width: 100px;
}
.child {
height: 100px;
}
@supports (display: layout(fallback-fn)) {
.test {
display: layout(fallback-fn);
background: green;
}
}
</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">
registerLayout('fallback-fn', class {
async intrinsicSizes() {}
async layout(children, edges, constraints, styleMap) {
const childFragments = await children.map(child => child.layoutNextFragment());
return {autoBlockSize: 0, childFragments, data: {fn: function() {}}};
}
});
</script>
<script>
importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, document.getElementById('code').textContent);
</script>
</html>