RUNOOB.COM
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>电脑学习网教程(runoob.com)</title> <style> body { background-image:url('gradient2.png'); background-repeat:repeat-x; } </style> </head> <body> <h1>Hello World!</h1> </body> </html>
运行结果