菜鸟学堂
在线运行
源代码
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟学堂(edu.jb51.net)</title> <style> p:only-of-type { background:#ff0000; } </style> </head> <body> <div><p>This is a paragraph.</p></div> <div><p>This is a paragraph.</p><p>This is a paragraph.</p></div> </body> </html>
运行结果
在线运行
菜鸟学堂 edu.jb51.net