That book does have a lot of vague passages and poor wording littered throughout... I can understand your frustration.
Basically what I'd suggest is using Firefox visit the following:
Download the file called: outliner.0.5.0.62.html
Then open that: outliner.0.5.0.62.html file with Firefox and on that page you've just downloaded you'll see:
Drag this link to your favorites bar: H5O v0.5.0.62
Next: hover over that link in that page [the file you downloaded not this post hyperlink] (hold your mouse down and drag that blue hyperlink) [H5O v0.5.0.62] into your bowser 'Bookmarks' menu list (making that a bookmark).
Then when it appears on your bookmarks list just open any generic HTML5 document using the normal method...
Then click upon the bookmark that sayeth H50 v0.5.0.62 hopefully a small box will appear within your document when you click the 'bookmark' which looketh similar to that Figure 3.1 on [p37]
Hopefully that should work.