1 files changed, 26 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-layout-api/layout-child/support/layout-child-worklet.js b/testing/web-platform/tests/css/css-layout-api/layout-child/support/layout-child-worklet.js
new file mode 100644
index 0000000000..70d1b7e457
--- /dev/null
+++ b/testing/web-platform/tests/css/css-layout-api/layout-child/support/layout-child-worklet.js
@@ -0,0 +1,26 @@
+import {areArraysEqual} from '/common/arrays.js';
+
+registerLayout('test', class {
+  static get inputProperties() {
+    return [ '--child-expected'];
+  }
+
+  static get childInputProperties() {
+    return [ '--child' ];
+  }
+
+  async intrinsicSizes() {}
+  async layout(children, edges, constraints, styleMap) {
+    const expected = JSON.parse(styleMap.get('--child-expected').toString());
+    const actual = children.map((child) => {
+      return child.styleMap.get('--child').toString().trim();
+    });
+
+    const childFragments = await Promise.all(children.map(child => child.layoutNextFragment({})));
+
+    if (!areArraysEqual(expected, actual))
+      return {autoBlockSize: 0, childFragments};
+
+    return {autoBlockSize: 100, childFragments};
+  }
+});