Core class that implements an image widget.
WP_Widget_Media_Gallery
Core class that implements a gallery widget.
WP_Widget_Media_Audio
Core class that implements an audio widget.
WP_Widget_Links
Core class used to implement a Links widget.
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WP_Widget_Custom_HTML
Core class used to implement a Custom HTML widget.
WP_Widget_Categories
Core class used to implement a Categories widget.
WP_Widget_Calendar
Core class used to implement the Calendar widget.
WP_Widget_Archives
Core class used to implement the Archives widget.
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WP_Nav_Menu_Widget
Core class used to implement the Navigation Menu widget.