视频语法

1<video src="/videos/demo.mp4" controls width="100%"></video>

1<iframe src="//player.bilibili.com/player.html?bvid=BV1xxxxxx" 
2        scrolling="no" border="0" frameborder="no" framespacing="0" 
3        allowfullscreen="true" width="100%" height="400">
4</iframe>

1<iframe width="100%" height="400" src="https://www.youtube.com/embed/xxxxxxxx" 
2        title="YouTube video player" frameborder="0" 
3        allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" 
4        allowfullscreen>
5</iframe>

1<video src="/videos/demo.mp4" controls width="500" height="300"></video>

1<video src="/videos/demo.mp4" controls width="60%"></video>

1<video src="/videos/demo.mp4" controls width="100%" poster="https://mu.baimu.live/img/mn/"></video>