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// Historically, document.open() created an entry in the session history so
// that the original page could be seen by going back. Test that this behavior
// no longer occurs.
//
// This test uses window.open() for variety, as most other tests in this
// directory use document.open(). An <iframe> would probably work also. We can
// always add an <iframe>-based test later if it is deemed necessary.
const t = async_test("document.open should not add an entry to the session history");
const frameURL = new URL("resources/history-frame.html", document.URL).href;
let origLength;
window.onFrameLoaded = t.step_func(() => {
window.onFrameLoaded = t.unreached_func("onFrameLoaded should only be called once");
assert_equals(win.document.URL, frameURL);
assert_true(win.document.body.textContent.includes("Old"));
origLength = win.history.length;
});
window.onDocumentOpen = t.step_func_done(() => {
window.onDocumentOpen = t.unreached_func("onDocumentOpen should only be called once");
assert_equals(win.document.URL, frameURL);
assert_true(win.document.body.textContent.includes("New"));
assert_not_equals(origLength, undefined);
assert_equals(win.history.length, origLength);
});
const win = window.open(frameURL);
t.add_cleanup(() => win.close());
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