:first-line 偽元素 · CSS基礎

## :first-line 偽元素 ### 定義和用法 :first-line選擇器用來指定選擇器第一行的樣式。 :first-line是偽元素，它生成包含元素的第一個格式化行的偽元素。 :first-line樣式表示元素中的第一行文本，無論該行中可能出現多少個詞。 :first-line只能附加到塊級元素。可以應用到首字母的屬性是有限的。 **例子：** ~~~ p.lead:first-line {font-weight: bold;} ~~~ **注意:** :first-line選擇器可以使用以下屬性：? * font properties * color properties? * background properties * word-spacing * letter-spacing * text-decoration * vertical-align * text-transform * line-height * clear **注意:** "first-line" 選擇器適用于塊級元素中。 ## 實例--每個元素的第一行選擇的樣式： ``` <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> <style> p:first-line { background-color:yellow; } </style> </head> <body> <h1>WWF's Mission Statement</h1> <p>To stop the degradation of the planet's natural environment and to build a future in which humans live in harmony with nature, by; conserving the world's biological diversity, ensuring that the use of renewable natural resources is sustainable, and promoting the reduction of pollution and wasteful consumption.</p> </body> </html> ```