document-write-during-load.html | Explore in Territory

<!DOCTYPE html>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<div id="parent" style="width: 200px; height: 200px;">
<iframe id="iframe" seamless src="about:blank"></iframe>
</div>
<script>
window.onload = function () {
    window.iframe = document.getElementById("iframe");
    alert("Ready");
    window.iframe.contentDocument.write("<!DOCTYPE html><html style='width: 100px; height: 100px; background-color: green'></html>");
    window.iframe.contentDocument.close();
    alert("PASS");
}
</script>

chromium/third_party/blink/web_tests/fast/parser/document-write-during-load.html