W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <style type="text/css"> [title~=hello] { color:red; } </style> </head> <body> <h1>可以应用样式：</h1> <h2 title="hello world">Hello world</h2> <p title="student hello">Hello W3School students!</h1> <hr /> <h1>无法应用样式：</h1> <h2 title="world">Hello world</h2> <p title="student">Hello W3School students!</p> </body> </html>