Basic tree to demonstrate the keyboard access feature.
Navigate to the first tree using the tab key. Then:
Go up/down using the cursor up/down keys.
Open/close using the left/right cursor keys (or the + and - keys except on linux mozilla because of the typeahead feature).
Toggle checkbox and radio input field values using the space key.
Execute the link of the node by using the enter key.
This works the same as in windows explorer.
In Mozilla (unlike Internet Explorer) a div cannot receive focus. Thus the "microsoft"
node cannot be "cursered" to. The "fix" is to make it a link. You can push the
"render mozilla compatible" button which adds the link to "#" to this node. Try it.
It's now a link pointing to "#" (nowhere). Works, but looks ugly and confuses the user.
Push the 3rd button "render mozilla compatible with style". In addition to the link,
it makes this link look like regular text (black and without underline).