1. DomName('WebGL2RenderingContext.getSupportedExtensions')
  2. DocsEditable()
  3. Experimental()
List<String> getSupportedExtensions()

Source 

@DomName('WebGL2RenderingContext.getSupportedExtensions')
@DocsEditable()
@Experimental() // untriaged
List<String> getSupportedExtensions() => _blink.BlinkWebGL2RenderingContext.instance.getSupportedExtensions_Callback_0_(this);