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Test Info:

async_test(t => {
const frame = document.createElement("iframe");
frame.onload = t.step_func(() => {
const frameW = frame.contentWindow,
frameD = frame.contentDocument;
assert_equals(frameW.document, frameD);
frame.remove();
assert_equals(frameW.document, frameD);
t.step_timeout(() => {
assert_equals(frameW.document, frameD);
t.done();
}, 100);
});
document.body.append(frame);
}, "Window object's document IDL attribute and discarding the browsing context");