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Test Info:

async_test(t => {
const input = document.body.appendChild(document.createElement("input"));
input.onfocus = t.step_func(() => {
const frame = document.body.appendChild(document.createElement("iframe")),
frameW = frame.contentWindow;
frameW.onfocus = t.unreached_func();
frame.remove();
frameW.focus();
t.step_timeout(() => {
assert_equals(document.activeElement, input);
t.done();
}, 100);
});
input.focus();
});