tabbable selector
Description: Selects elements which the user can focus via tabbing.
jQuery( ":tabbable" )
Some elements are natively tabbable, while others require explicitly setting a positive tab index. In all cases, the element must be visible in order to be tabbable.
Elements of the following type are tabbable if they do not have a negative tab index and are not disabled: input, select, textarea, button, and object. Anchors are focusable if they have an href or positive tabindex attribute. area elements are focusable if th
