1. @DomName('WebGL2RenderingContext.vertexAttrib4f')
  2. @DocsEditable()
  3. @Experimental()
void vertexAttrib4f(int indx, num x, num y, num z, num w)

Source 

@DomName('WebGL2RenderingContext.vertexAttrib4f')
@DocsEditable()
@Experimental() // untriaged
void vertexAttrib4f(int indx, num x, num y, num z, num w) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .vertexAttrib4f_Callback_5_(this, indx, x, y, z, w);