code: func (w *Window) Change(valueMask int, valueList ...uint32) {
  	xproto.ChangeWindowAttributes(w.X.Conn(), w.Id,
  		uint32(valueMask), valueList)
  }
docs: // Change issues a ChangeWindowAttributes request with the provided mask
  // and value list. Please see Window.Create for an example on how to use
  // the mask and value list.