1 files changed, 38 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-layout-api/edges/support/edges.js b/testing/web-platform/tests/css/css-layout-api/edges/support/edges.js
new file mode 100644
index 0000000000..b70a42f398
--- /dev/null
+++ b/testing/web-platform/tests/css/css-layout-api/edges/support/edges.js
@@ -0,0 +1,38 @@
+import {areArraysEqual} from '/common/arrays.js';
+
+function parseNumber(value) {
+  const num = parseInt(value.toString());
+  if (isNaN(num)) return 0;
+  return num;
+}
+
+registerLayout('test', class {
+  static get inputProperties() {
+    return [
+      '--edges-inline-start-expected',
+      '--edges-inline-end-expected',
+      '--edges-block-start-expected',
+      '--edges-block-end-expected',
+    ];
+  }
+
+  async intrinsicSizes() {}
+  async layout(children, edges, constraints, styleMap) {
+    const actual = this.constructor.inputProperties.map(
+      prop => parseNumber(styleMap.get(prop))
+    );
+
+    const expected = [
+      edges.inlineStart,
+      edges.inlineEnd,
+      edges.blockStart,
+      edges.blockEnd,
+    ];
+
+    if (!areArraysEqual(expected, actual)) {
+      return {autoBlockSize: 0, childFragments: []};
+    }
+
+    return {autoBlockSize: 100, childFragment: []};
+  }
+});