1 files changed, 22 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-layout-api/constraints/support/constraints-fixed-block-size.js b/testing/web-platform/tests/css/css-layout-api/constraints/support/constraints-fixed-block-size.js
new file mode 100644
index 0000000000..25d73ef615
--- /dev/null
+++ b/testing/web-platform/tests/css/css-layout-api/constraints/support/constraints-fixed-block-size.js
@@ -0,0 +1,22 @@
+registerLayout('test', class {
+  static get inputProperties() {
+    return ['--expected-block-size'];
+  }
+
+  async intrinsicSizes() {}
+  async layout([child], edges, constraints, styleMap) {
+    let childFixedInlineSize = 0;
+    let childFixedBlockSize = 0;
+    if (constraints.fixedBlockSize === JSON.parse(styleMap.get('--expected-block-size'))) {
+      childFixedInlineSize = 100;
+      childFixedBlockSize = 100;
+    }
+
+    const childFragments = [await child.layoutNextFragment({
+      fixedInlineSize: childFixedInlineSize,
+      fixedBlockSize: childFixedBlockSize,
+    })];
+
+    return {childFragments};
+  }
+});