1. @DomName('WebGL2RenderingContext.vertexAttrib3f')
  2. @DocsEditable()
  3. @Experimental()
void vertexAttrib3f(int indx, num x, num y, num z)

Source 

@DomName('WebGL2RenderingContext.vertexAttrib3f')
@DocsEditable()
@Experimental() // untriaged
void vertexAttrib3f(int indx, num x, num y, num z) =>
    _blink.BlinkWebGL2RenderingContext.instance
        .vertexAttrib3f_Callback_4_(this, indx, x, y, z);