菜鸟学堂
在线运行
源代码
<!DOCTYPE html> <html> <head> <style> [class|=top] { background:yellow; } </style> </head> <body> <h1 class="top-header">Welcome</h1> <p class="top-text">Hello world!</p> <p class="content">Are you learning CSS?</p> <p><b>Note:</b> For [<i>attribute</i>|=<i>value</i>] to work in IE8 and earlier, a DOCTYPE must be declared.</p> </body> </html>
运行结果
在线运行
菜鸟学堂 edu.jb51.net