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