update-dom-during-undoing-in-textarea.html

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This WPT test may be referenced by the following Test IDs:
- /editing/crashtests/update-dom-during-undoing-in-textarea.html - WPT Dashboard Interop Dashboard

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title>Test for updating the DOM tree while execCommand("undo") is running in the textarea</title>

<script>

"use strict";

let count = 0;

addEventListener("load", () => {

  document.execCommand("insertText", false, "F");

  document.execCommand("undo");

});

function onInputOfTextarea() {

  if (count) {

    document.querySelector("base").appendChild(

      document.querySelector("content")

);

  count++;

</script>

</head>

<body>

<iframe></iframe>

<textarea autofocus oninput="onInputOfTextarea()">a</textarea>

<base></base>

<content>

<menu>

</body>

</html>