js/xpconnect/tests/browser/browser_realm_key_object_prototype_frame.html


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<script type="text/javascript">
// Access to the top-level window property before getting access.
// This will create an entry in cross-origin realm map.
try {
  window.top.Object;
} catch (e) {}

document.domain = "mochi.test";

window.top.check();
</script>