HTML5自适应全屏幕视频背景（背景跟随滚动）
演示运行地址：https://wow.techbrood.com/fiddle/89
https://wow.techbrood.com/fiddle/89
<!DOCTYPE html><!-- This web page is copied by "https://bazhan.wang" --><html><head><meta charset="utf-8">
<style>
h1 {
margin: 0;
color: red;
}
video {
position: fixed;
right: 0;
bottom: 0;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: -100;
background-size: cover;
}
</style>
</head>
<body>
<video src="./bg.mp4" autoplay loop muted ></video>
</body></html>