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diff --git a/testing/web-platform/tests/css/css-layout-api/fallback-layout/invalid-child.https.html b/testing/web-platform/tests/css/css-layout-api/fallback-layout/invalid-child.https.html
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+++ b/testing/web-platform/tests/css/css-layout-api/fallback-layout/invalid-child.https.html
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+<!DOCTYPE html>
+<html class=reftest-wait>
+<link rel="help" href="https://drafts.css-houdini.org/css-layout-api/#invoke-a-layout-callback">
+<link rel="match" href="fallback-layout-fallback-ref.html">
+<meta name="assert" content="This test checks that a layout() class performing layout on an invalid child will fallback to block layout." />
+<style>
+.test {
+ background: red;
+ border: solid 2px;
+ width: 100px;
+}
+
+.test > div {
+ height: 100px;
+}
+
+@supports (display: layout(bad-child-layout)) {
+ .test {
+ display: layout(bad-child-layout);
+ background: green;
+ }
+}
+</style>
+<script src="/common/reftest-wait.js"></script>
+<script src="/common/worklet-reftest.js"></script>
+
+<div class="test">
+ <div></div>
+</div>
+
+<script id="code" type="text/worklet">
+registerLayout('bad-child-layout', class {
+ static get inputProperties() { return ['--fail']; }
+
+ async intrinsicSizes() {}
+ async layout(children, _, __, styleMap) {
+ if (styleMap.get('--fail').toString() !== 'true') {
+ this.child = children[0];
+ }
+
+ // Try to perform layout on the child. If its invalid (we skipped the if
+ // statement above) we should fallback to block layout.
+ const fragment = await this.child.layoutNextFragment({});
+
+ return {autoBlockSize: 0, childFragments: [fragment]};
+ }
+});
+</script>
+
+<script>
+function raf() {
+ return new Promise((resolve) => {
+ requestAnimationFrame(() => {
+ resolve();
+ });
+ });
+}
+
+(async function() {
+ if (typeof CSS.layoutWorklet === 'undefined') {
+ takeScreenshot();
+ return;
+ }
+
+ await importWorklet(CSS.layoutWorklet, document.getElementById('code').textContent);
+
+ // Ensure that all instances have a child to perform an invalid layout upon.
+ const test = document.getElementsByClassName('test')[0];
+ for (let i = 0; i < 100; i++) {
+ test.innerHTML = '<div><div>';
+ await raf();
+ }
+
+ // The next layout should mean that we will fallback to block.
+ test.innerHTML = '<div></div>';
+ test.style.setProperty('--fail', 'true');
+
+ // Finish up the test.
+ await raf();
+ await raf();
+ takeScreenshot();
+})();
+</script>
+</html>