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<!doctype html>
<meta charset=utf-8>
<title>document.write in mutation observer</title>
<link rel=help href="https://html.spec.whatwg.org/#parsing-main-incdata">
<link rel=help href="https://html.spec.whatwg.org/#perform-a-microtask-checkpoint">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
[
{name: "classic", src: "resources/mutation-observer-iframe-script.html"},
{name: "module", src: "resources/mutation-observer-iframe-script-module.html"},
{name: "async", src: "resources/mutation-observer-iframe-script-async.html"},
{name: "defer", src: "resources/mutation-observer-iframe-script-defer.html"},
].forEach(({name, src}) => {
promise_test(async t => {
const iframe = document.createElement("iframe");
iframe.onerror = t.unreached_func("Error loading iframe");
document.addEventListener("scriptRan", t.unreached_func("script should not run"));
document.addEventListener("documentWriteDone", t.step_func(() => {
assert_equals(iframe.contentDocument.body.textContent, "document.write body contents\n");
}));
let loadPromise = new Promise(resolve => {
iframe.onload = t.step_func(() => {
assert_equals(iframe.contentDocument.body.textContent, "document.write body contents\n");
resolve();
});
});
iframe.src = src;
document.body.appendChild(iframe);
await loadPromise;
}, `Mutation observer for ${name} script element`);
});
</script>
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