1. @DomName('WebGL2RenderingContext.drawArraysInstanced')
  2. @DocsEditable()
  3. @Experimental()
void drawArraysInstanced(int mode, int first, int count, int instanceCount)

Source 

@DomName('WebGL2RenderingContext.drawArraysInstanced')
@DocsEditable()
@Experimental() // untriaged
void drawArraysInstanced(int mode, int first, int count, int instanceCount) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .drawArraysInstanced_Callback_4_(
            this, mode, first, count, instanceCount);