1 files changed, 10 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/browsers/windows/document-domain-nested-set.window.js b/testing/web-platform/tests/html/browsers/windows/document-domain-nested-set.window.js
new file mode 100644
index 0000000000..13c0d50ba0
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/windows/document-domain-nested-set.window.js
@@ -0,0 +1,10 @@
+test(() => {
+  // As the initial:about frame document reuses the origin of this document, setting document.domain
+  // from the frame, resulting in a origin mutation, has no effect on these documents being able to
+  // reach each other, as they share the same "physical" origin.
+  document.body.appendChild(document.createElement('iframe'));
+  const script = document.createElement("script");
+  script.text = "document.domain = document.domain";
+  window[0].document.body.appendChild(script);
+  assert_equals(window[0].document.body.localName, "body");
+}, "Initial about:blank frame and document.domain in the frame");