Marco Nie - html5
https://blog.niekun.net/tag/html5/
HTML5视频嵌入test
https://blog.niekun.net/archives/64.html
2019-02-19T14:50:00+08:00测试视频：
video is not supported
var x = document.getElementsByClassName("movie");
var i;
for (i = 0; i < x.length; i++) {
x[i].style.height=x[i].scrollWidth*9/16+"px";
}
官方文档：https://html.spec.whatwg.org/#the-video-element