51help TIY
码：
<!DOCTYPE html> <html> <head> <style> [lang|=en] { background:yellow; } </style> </head> <body> <p lang="en">Hello!</p> <p lang="en-us">Hi!</p> <p lang="en-gb">Ello!</p> <p lang="us">Hi!</p> <p lang="zh">nihao!</p> <p><b>注释：</b>对于 IE8 的 [attribute|=value] <!DOCTYPE>。</p> </body> </html>
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