【3】同じ名前であっても、CSSの記述順には関係なく、相関関係で内容が上書き適用されていく 【4】半角スペースでclass名をふたつ適用。

How to Override CSS Inside DIV Classes. If you ever need to tweak the appearance of a page on your business website, you may have to modify Cascading Style Sheet code. Developers use CSS to set ...

Ryan Boudreaux continues his tutorial on getting acquainted with jQuery by showing you how to get objects by ID and Class selectors and by Tag and Attribute.