Function: Tests support for compressing JavaScript from PHP.

Function: Echoes a submit button, with provided text and appropriate class(es).

Function: Returns a submit button, with provided text and appropriate class.

Function: Prints out the settings fields for a particular settings section.

Function: Registers a settings error to be displayed to the user.

Function: Fetches settings errors registered by add_settings_error().

Function: Displays settings errors registered by add_settings_error().

Function: Outputs the modal window used for attaching media to posts or pages in the media-listing screen.