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> h1 {letter-spacing:2px;} h2 {letter-spacing:-3px;} </style> </head> <body> <h1>This is heading 1</h1> <h2>This is heading 2</h2> </body> </html>
运行结果