We had better rename some ENABLE flags for consistency. For example, DATALIST -> DATALIST_ELEMENT DETAILS -> DETAILS_ELEMENT FILTERS -> SVG_FILTERS METER_TAG -> METER_ELEMENT PROGRESS_TAG -> PROGRESS_ELEMENT VIDEO_TRACK -> TRACK_ELEMENT (?) Should we add _API to BATTERY_STATUS, GAMEPAD, PINTER_LOCK, VIBRATION, and so on?
FYI: http://trac.webkit.org/wiki/FeatureFlags