1. DomName('WebGL2RenderingContext.deleteSync')
  2. DocsEditable()
  3. Experimental()
void deleteSync(Sync sync)

Source 

@DomName('WebGL2RenderingContext.deleteSync')
@DocsEditable()
@Experimental() // untriaged
void deleteSync(Sync sync) => _blink.BlinkWebGL2RenderingContext.instance.deleteSync_Callback_1_(this, sync);