1 files changed, 17 insertions, 0 deletions
diff --git a/testing/web-platform/tests/client-hints/viewport-size/viewport-size-iframe.https.html b/testing/web-platform/tests/client-hints/viewport-size/viewport-size-iframe.https.html
new file mode 100644
index 0000000000..6cb549d8f1
--- /dev/null
+++ b/testing/web-platform/tests/client-hints/viewport-size/viewport-size-iframe.https.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+promise_test(t => {
+  return new Promise(resolve => {
+    window.addEventListener("message", t.step_func(e => {
+      assert_equals(e.data.viewportWidth, window.innerWidth.toString());
+      assert_equals(e.data.viewportHeight, window.innerHeight.toString());
+      resolve();
+    }));
+  });
+});
+</script>
+<iframe src="../resources/viewport-frame.py" width=503 height=614></iframe>