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+++ b/testing/web-platform/tests/css/css-layout-api/fragment-data.https.html
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+<!DOCTYPE html>
+<html class=reftest-wait>
+<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#dom-layoutfragment-data">
+<link rel="match" href="green-square-ref.html">
+<meta name="assert" content="This test checks that passing data to a parent 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();
+
+ // Use JSON.stringify to make sure the structured cloning worked.
+ if (childFragment.data !== DATA &&
+ JSON.stringify(childFragment.data) === JSON.stringify(DATA)) {
+ return {autoBlockSize: 100, childFragments: [childFragment]};
+ }
+
+ return {autoBlockSize: 0, childFragments: [childFragment]};
+ }
+});
+
+registerLayout('child', class {
+ async intrinsicSizes() {}
+ async layout(children, edges, constraints, styleMap) {
+ return {autoBlockSize: 10, data: DATA};
+ }
+});
+</script>
+
+<script>
+importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, document.getElementById('code').textContent);
+</script>
+</html>