johnboxall/recover.html

## recover.html
<html>
<head>
    <script>
        /**
         * In 1s, `onError` will be called to 'recover' the original document.
         */
        onError = function() {
          var s;
          while (s = document.scripts[0]) s.parentNode.removeChild(s);

          var openingHTMLTag = openingTag(document.documentElement);
          var headEl = $$('head')[0];
          var openingHeadTag = openingTag(head);
          var headInnerHTMLandClosingTag = head.innerHTML;
          var bodyOuterHTML = $$('plaintext')[0].innerText;

          document.open();
          document.write(openingHTMLTag, openingHeadTag, headInnerHTMLandClosingTag, bodyOuterHTML);
          document.close();
        }

        function openingTag(el) {
          var tagName = el.tagName;
          return el.cloneNode(false).outerHTML.replace(RegExp('</' + tagName + '>$','i'), '\n');
        }

        function $$(tag) {
          return document.getElementsByTagName(tag);
        }

        setTimeout(onError, 1000);
    </script>
    <title>Capturing Recovery Test</title>
    <plaintext>
</head>
<body>
    <h1>Capturing Recovery Test</h1>
</body>
</html>
	<html>
	<head>
	<script>
	/**
	* In 1s, `onError` will be called to 'recover' the original document.
	*/
	onError = function() {
	var s;
	while (s = document.scripts[0]) s.parentNode.removeChild(s);

	var openingHTMLTag = openingTag(document.documentElement);
	var headEl = $$('head')[0];
	var openingHeadTag = openingTag(head);
	var headInnerHTMLandClosingTag = head.innerHTML;
	var bodyOuterHTML = $$('plaintext')[0].innerText;

	document.open();
	document.write(openingHTMLTag, openingHeadTag, headInnerHTMLandClosingTag, bodyOuterHTML);
	document.close();
	}

	function openingTag(el) {
	var tagName = el.tagName;
	return el.cloneNode(false).outerHTML.replace(RegExp('</' + tagName + '>$','i'), '\n');
	}

	function $$(tag) {
	return document.getElementsByTagName(tag);
	}

	setTimeout(onError, 1000);
	</script>
	<title>Capturing Recovery Test</title>
	<plaintext>
	</head>
	<body>
	<h1>Capturing Recovery Test</h1>
	</body>
	</html>