<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <link rel="stylesheet" href="59.css" media="screen and (max-width:800px)"> <link rel="stylesheet" href="60.css" media="screen and (min-width:800px)"> <style> /* @media screen and (max-width:800px){ .demo{ background: red; } } @media screen and (min-width:800px){ .demo{ background: grey; } } */ </style> </head> <body> <div class="demo"> 1213121331 </div> </body> </html>
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