源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> <style> p:first-child { color:blue; } </style> </head> <body> <p>This is some text.</p> <p>This is some text.</p> <p><b>注意:</b>对于 :first-child 工作于 IE8以及更早版本的浏览器, DOCTYPE必须已经声明.</p> </body> </html>
运行结果：