W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<html> <head> <style type="text/css"> p.important {color:red;} h1.important {color:blue;} </style> </head> <body> <h1 class="important">This heading is very important.</h1> <p class="important">This paragraph is very important.</p> <p>This is a paragraph.</p> <p>This is a paragraph.</p> <p>This is a paragraph.</p> <p>...</p> </body> </html>