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async_test(t => {
const iframe = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => iframe.remove());
iframe.src = "/common/blank.html";
iframe.onload = t.step_func_done(() => {
const win = iframe.contentWindow;
const doc = iframe.contentDocument;
assert_equals(win.history.state, null);
win.history.replaceState("state", "");
assert_equals(win.history.state, "state");
assert_equals(doc.open(), doc);
assert_equals(win.history.state, "state");
});
}, "history.state is kept by document.open()");
async_test(t => {
const iframe = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => iframe.remove());
iframe.src = "/common/blank.html";
iframe.onload = t.step_func_done(() => {
const win = iframe.contentWindow;
const doc = iframe.contentDocument;
assert_equals(win.history.state, null);
win.history.replaceState("state", "");
assert_equals(win.history.state, "state");
assert_equals(doc.open("", "replace"), doc);
assert_equals(win.history.state, "state");
});
}, "history.state is kept by document.open() (with historical replace parameter set)");
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