Gxlsystem TIY Editor
Gxlsystem 在线教程
改变方向
暗黑模式
运行代码
<html> <head> <style type="text/css"> h1 em {color:red;} </style> </head> <body> <h1>This is a <em>important</em> heading</h1> <p>This is a <em>important</em> paragraph.</p> </body> </html>