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 and other information`

selection collapsed:

selection parentElement:

## `delete selection`

delete this

The current selection should be deleted when you mouse over this text span.