Tests basic dump-as-markup functionality.
| <!DOCTYPE html>
| <html>
|   <head>
|     <script>
|       src="../../resources/dump-as-markup.js"
|     "\n\n"
|   <body>
|     <div>
|       id="bar"
|       "<#selection-anchor>foo"
|       <hr>
|       <#selection-focus>
|     "\n"
|     <input>
|       type="text"
|       this.value=""
|       <shadow:root>
|         <div>
|           contenteditable="plaintext-only"
|     "\n"
|     <div>
|       contenteditable=""
|       id="foo"
|       "\n  foo"
|       "   bar\n"
|     "\n"
|     <script>
|       "foo.firstChild.splitText(6);"
|     "\n"
|     <span>
|       "foo"
|     <span>
|       "bar"
|     "\n"
|     <div>
|       <div>
|         <b>
|           "sdf"
|         <i>
|           "sdf"
|         "sdf"
|     "\n"
|     <iframe>
|       src="data:text/html;charset=utf-8,<!DOCTYPE%20HTML%20PUBLIC%20"-//W3C//DTD%20HTML%204.0//EN">%0D%0A<html%20lang%3D"en">%0D%0A%20<head>%0D%0A%20%20<title>Test</title>%0D%0A%20%20<style%20type%3D"text/css">%0D%0A%20%20</style>%0D%0A%20</head>%0D%0A%20<body>%0D%0A%20%20<p></p>%0D%0A%20</body>%0D%0A</html>%0D%0A"
|     "\n\n"
|     <script>
|       "\nMarkup.description("Tests basic dump-as-markup functionality.");\nwindow.getSelection().selectAllChildren(bar)\n"
|     "\n"

FRAME 0:
| <head>
|   "\n  "
|   <title>
|     "Test"
|   "\n  "
|   <style>
|     type="text/css"
|     "\n  "
|   "\n "
| "\n "
| <body>
|   "\n  "
|   <p>
|   "\n \n\n"