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// This tests whether the insertion point gets reset before or after the readystatechange event.
// See https://github.com/whatwg/html/pull/6613#discussion_r620171070.
// Recall that resetting the insertion point means that document.write() performs the document open
// steps and blows away previous content in the document.
async_test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => { frame.remove(); });
frame.src = "../opening-the-input-stream/resources/dummy.html";
frame.onload = t.step_func_done(() => {
const states = [];
frame.contentDocument.onreadystatechange = t.step_func(() => {
if (frame.contentDocument.readyState === "interactive") {
assert_not_equals(frame.contentDocument.textContent, "", "Precondition check: dummy document is not empty");
frame.contentDocument.write("Some text");
// If the insertion point is reset before the readystatechange handler, then the
// document.write() call above will blow away the text originally in dummy.html, leaving only what we wrote.
assert_equals(frame.contentDocument.textContent, "Some text");
}
});
});
}, "document.write() during readystatechange to interactive");
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