<!DOCTYPE html><html> <head> <title> new document </title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <style> div{border:3px solid green;} </style> <script type="text/javascript"> c=document.getElementById('ok');c.style.borderBottom="1px solid red"; </script> </head> <body> <div id="ok"> 111111</div> </body></html>w3c里说可以这么用啊，为啥不行？
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