1. @DomName('WebGL2RenderingContext.vertexAttrib2f')
  2. @DocsEditable()
  3. @Experimental()
void vertexAttrib2f(int indx, num x, num y)

Source 

@DomName('WebGL2RenderingContext.vertexAttrib2f')
@DocsEditable()
@Experimental() // untriaged
void vertexAttrib2f(int indx, num x, num y) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .vertexAttrib2f_Callback_3_(this, indx, x, y);