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Test Info:

test(() => {
// As the initial:about frame document reuses the origin of this document, setting document.domain
// from this document, 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'));
document.domain = document.domain;
// Ensure we can still access the child browsing context
assert_equals(window[0].document.body.localName, "body");
}, "Initial about:blank frame and document.domain");