File: mutation-observer-iframe-script-module.html

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<!doctype html>
<script>
new MutationObserver((mutations, observer) => {
  mutations.forEach(({ addedNodes }) => {
    addedNodes.forEach(node => {
      if (node.nodeType == 1 && node.tagName == "SCRIPT") {
        document.write("document.write body contents\n");
        document.close();
        window.parent.document.dispatchEvent(new CustomEvent("documentWriteDone"));
      }
    });
  });
}).observe(document.documentElement, { childList: true, subtree: true });
</script>
Initial body contents
<script type="module">window.parent.document.dispatchEvent(new CustomEvent("scriptRan"));</script>