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<!DOCTYPE html> <html> <body> <video width="320" height="240" controls> <source src="/i/movie.mp4" type="video/mp4" media="screen and (min-width:320px)"> <source src="/i/movie.ogg" type="video/ogg" media="screen and (min-width:320px)"> Your browser does not support the video tag. </video> <p><b>注释：</b>目前几乎没有浏览器支持 media 属性。</p> </body> </html>