xxxxxxxxxx<html><head><meta charset="utf-8"> <title>W3Cschool教程(w3cschool.cn)</title> <style> p { border:1px solid red; outline:green dotted thick; }</style></head><body> <p><b>注意:</b> 如果只有一个!DOCTYPE指定IE8支持 outline属性。</p></body></html>