All information contained in the HTMLib is available directly from the Index/Contents buttons in the toolbar. Below is a description of the buttons :

This is the Contents button. It displays the expanding table of contents for the HTMLib in the left hand frame.
The Index button. It displays the HTMLib indices. There are two separaye indices available, one by Element and one by Attribute, to make it easier to search for discrete information within the HTMLib.
The Quick Reference button. The Quick Reference is a kind of merged contents/index display. All currently supported HTML elements are listed (together with their attributes) with direct links to each.
The Print button. This prints the currently displayed topic (being displayed in this window). NOTE : Currently not implemented.
The Back button. This navigates back through the history of the displayed topics.
The Help button. Pressing this button displays this document, but then you already know that one.