1 files changed, 49 insertions, 0 deletions
diff --git a/tests/wpt/web-platform-tests/css/css-layout-api/fragment-data-sab-failure.https.html b/tests/wpt/web-platform-tests/css/css-layout-api/fragment-data-sab-failure.https.html
new file mode 100644
index 00000000000..59a9f835728
--- /dev/null
+++ b/tests/wpt/web-platform-tests/css/css-layout-api/fragment-data-sab-failure.https.html
@@ -0,0 +1,49 @@
+<!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 a SharedArrayBuffer can't be passed to the parent layout." />
+<style>
+.test {
+  background: red;
+  width: 100px;
+}
+
+.child {
+  height: 100px;
+}
+
+@supports (display: layout(fallback-sab)) {
+  .test {
+    display: layout(fallback-sab);
+    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-sab', class {
+  *intrinsicSizes() {}
+  *layout() {}
+  *layout(children, edges, constraints, styleMap) {
+    const childFragments = yield children.map(child => child.layoutNextFragment());
+
+    if (typeof SharedArrayBuffer !== 'undefined') {
+      return {autoBlockSize: 0, childFragments, data: {sab: new SharedArrayBuffer(4) }};
+    } else {
+      throw Error();
+    }
+  }
+});
+</script>
+
+<script>
+importWorkletAndTerminateTestAfterAsyncPaint(CSS.layoutWorklet, document.getElementById('code').textContent);
+</script>
+</html>