偽類（Pseudo-classes ）與偽元素（Pseudo-element）兩者都是CSS 為了擴張 ... 而偽元素則是以before、after 這兩兄弟為主要被探討的對象，可以說是偽 ... ... <看更多>

你好，我們是六角學院這是我們與學員交流的影片如果你對程式課程有興趣可以參考：http://www.hexschool.com/ ... <看更多>

If you want :before and :after to work, you need to give them content , otherwise they don't really 'exist'. The easiest thing to do is, ... ... <看更多>

The draft spec for CSS4 pseudo-selectors still state that ::before and ::after must have a content property with a value that is not none, ... ... <看更多>

It has nothing to do with the_content() . ::after is a pseudo element that's added with CSS. Note that the ::after element in the dev tools ... ... <看更多>