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Test Info:

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");