1. DomName('MediaKeys.isTypeSupported')
  2. DocsEditable()
  3. Experimental()
bool isTypeSupported(String keySystem, String contentType)

Source 

@DomName('MediaKeys.isTypeSupported')
@DocsEditable()
@Experimental() // untriaged
static bool isTypeSupported(String keySystem, String contentType) => _blink.BlinkMediaKeys.instance.isTypeSupported_Callback_2_(keySystem, contentType);