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代码编辑器：
<!DOCTYPE html> <style> [lang|=en] { background:yellow; } </style> <p lang="en">Hello!</p> <p lang="en-us">Hi!</p> <p lang="en-gb">Ello!</p> <p lang="us">Hi!</p> <p lang="no">Hei!</p> <p><b>Note:</b> For [<i>attribute</i>|=<i>value</i>] to work in IE8 and earlier, a DOCTYPE must be declared.</p> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：