For the player, the multimedia default is Flash. When Flash is not available, the player will now default to html5-fallback (if available). The parameter takes any one of the following values.
Flash: For desktop, enables default Adobe Flash playback. For mobile devices, sets the preference to Flash but also allows HTML5 fallback. Flash-only: Flash playback only. If Flash is not detected, an error message is displayed and the viewer requested to install the Flash plug-in. HTML5-fallback: Uses Flash but enables fallback to HTML5. HTML5-priority: Sets HTML5 as the preferred playback mechanism but also allows Flash fallback.