【代码片段】HTML5嵌入媒体 (HTML5 Embedded Media)

<video poster="images/preview.png" width="1280" height="720" controls="controls" preload="none"> 
    <source src="media/video.mp4" type="video/mp4"></source> 
    <source src="media/video.webm" type="video/webm"></source> 
    <source src="media/video.ogg" type="video/ogg"></source>
</video>

<audio controls="controls" preload="none">
    <source src="music.ogg" type="audio/ogg">
    <source src="music.mp3" type="audio/mpeg">
</audio>