Outputs the settings update form.

Get schema for properties of a widget instance (item).

Whether the widget has content to show.

Determine if the supplied attachment is for a valid attachment post with the specified MIME type.

Render form template scripts.

Render the media on the frontend.

Sanitize a token list string, such as used in HTML rel and class attributes.

Sanitizes the widget form values as they are saved.

Displays the widget on the front-end.

Core class that implements an audio widget.