<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>