1. DomName('WebGLRenderingContext.vertexAttrib2f')
  2. DocsEditable()
void vertexAttrib2f(int indx, num x, num y)

Source 

@DomName('WebGLRenderingContext.vertexAttrib2f')
@DocsEditable()
void vertexAttrib2f(int indx, num x, num y) => _blink.BlinkWebGLRenderingContext.instance.vertexAttrib2f_Callback_3_(unwrap_jso(this), indx, x, y);