Shortcut to `jQuery.addClass()` on the Area.
Add a single Area to the end of the "visible Areas" list.
Shortcut to `jQuery.hasClass()` on the Area.
Attach the given area to the DOM and add it to the list of visible Areas.
Count the currently visible Areas.
Fired after event handlers were attached to the Area
Disable scrolling of the body.
Returns the Areas hook-key which is used for action/filter names
Fired before the Area position is changed.
Tests, whether the matches the expected type string.