* the default menu image so an icon can be added to div.wp-menu-image as background
* with CSS. Dashicons and base64-encoded data:image/svg_xml URIs are also handled
* as special cases.
* the default menu image so an icon can be added to div.wp-menu-image as background
* with CSS. Dashicons and base64-encoded data:image/svg_xml URIs are also handled
* as special cases.