dojo.html selection test

`clearSelection`

The current selection should be cleared when you mouse over this paragraph.

`disableSelection` and `enableSelection`

This is some test text!

toggling this checkbox should enable and disable the ability to select the above paragraph.

`selectElement`

This is some test text!

`isSelectionCollapsed`

selection collapsed:

DEBUG: DEPRECATED: dojo.xml.domUtil is deprecated, use dojo.dom instead

DEBUG: DEPRECATED: dojo.xml.htmlUtil is deprecated, use dojo.html instead

DEBUG: DEPRECATED: dojo.graphics.htmlEffects is deprecated, use dojo.fx.html instead