diff --git a/html/browsers/the-window-object/noopener-noreferrer-sizing.window.js b/html/browsers/the-window-object/noopener-noreferrer-sizing.window.js
new file mode 100644
index 00000000000000..cc53ba5f2f5941
--- /dev/null
+++ b/html/browsers/the-window-object/noopener-noreferrer-sizing.window.js
@@ -0,0 +1,17 @@
+const windowProps = ["innerWidth", "innerHeight"];
+
+["noopener", "noreferrer"].forEach(openerStyle => {
+  async_test(t => {
+    const channelName = "34342" + openerStyle + "8907";
+    const channel = new BroadcastChannel(channelName);
+    window.open("support/sizing-target.html?" + channelName, "", openerStyle);
+    channel.onmessage = t.step_func_done(e => {
+      // Send message first so if asserts throw the popup is still closed
+      channel.postMessage(null);
+
+      for(const prop of windowProps) {
+        assert_equals(window[prop], e.data[prop]);
+      }
+    });
+  }, `window.open() with ${openerStyle} should have equal viewport width and height`);
+});
diff --git a/html/browsers/the-window-object/support/sizing-target.html b/html/browsers/the-window-object/support/sizing-target.html
new file mode 100644
index 00000000000000..7cd5348a858569
--- /dev/null
+++ b/html/browsers/the-window-object/support/sizing-target.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<script>
+  const windowProps = ["innerWidth", "innerHeight"];
+  const windowPropsObj = {};
+  const channelName = location.search.substr(1);
+  const channel = new BroadcastChannel(channelName);
+  for (const prop of windowProps) {
+    windowPropsObj[prop] = window[prop];
+  }
+  channel.postMessage(windowPropsObj);
+
+  // Because messages are not delivered synchronously and because closing a
+  // browsing context prompts the eventual clearing of all task sources, this
+  // document should not be closed until the opener document has confirmed
+  // receipt.
+  channel.onmessage = () => { window.close() };
+</script>
