1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/tests/resize-observer/idlharness.window.js b/testing/web-platform/tests/resize-observer/idlharness.window.js
new file mode 100644
index 0000000000..2d459b0b12
--- /dev/null
+++ b/testing/web-platform/tests/resize-observer/idlharness.window.js
@@ -0,0 +1,37 @@
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+// META: script=resources/resizeTestHelper.js
+
+'use strict';
+
+// https://wicg.github.io/ResizeObserver/
+
+idl_test(
+  ['resize-observer'],
+  ['dom', 'geometry'],
+  async idl_array => {
+    idl_array.add_objects({
+      ResizeObserver: ['observer'],
+      ResizeObserverEntry: ['entry'],
+    });
+
+    const div = document.createElement('div');
+    document.body.appendChild(div);
+    let helper = new ResizeTestHelper(
+      "ResizeObserverEntry creator",
+      [
+        {
+          setup: observer => {
+            self.observer = observer;
+            observer.observe(div);
+            div.style.width = "5px";
+          },
+          notify: entries => {
+            self.entry = entries[0];
+            assert_equals(entries[0].contentRect.width, 5, "target width");
+          }
+        }
+      ]);
+    await helper.start();
+  }
+);