To provide a seam of attractive appearance in which tightening force is increased and raveling are prevented drastically. Then, by fitting together an engaging hook, a projecting hook, and peripheral edges of a visor cover and the visor rim, the visor rim and the visor cover are assembled. The user interface has a first state in which a first view of the page of content is displayed, with the links presentation being displayed in a designated region of the user interface.