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// In an earlier version of the HTML Standard, document open steps had "prompt
// to unload document" as a step. Test that this no longer happens.
async_test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => frame.remove());
frame.src = "/common/blank.html";
frame.onload = t.step_func(() => {
frame.contentWindow.onbeforeunload = t.unreached_func("beforeunload should not be fired");
frame.contentDocument.open();
t.step_timeout(t.step_func_done(() => {
// If the beforeunload event has still not fired by this point, we
// consider the test a success. `frame.remove()` above will allow the
// `load` event to be fired on the top-level Window, thus unblocking
// testharness.
}), 500);
});
}, "document.open() should not fire a beforeunload event");
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