1. DomName('WebGL2RenderingContext.scissor')
  2. DocsEditable()
  3. Experimental()
void scissor(int x, int y, int width, int height)

Source 

@DomName('WebGL2RenderingContext.scissor')
@DocsEditable()
@Experimental() // untriaged
void scissor(int x, int y, int width, int height) => _blink.BlinkWebGL2RenderingContext.instance.scissor_Callback_4_(this, x, y, width, height);