HTML basic combing

Tucao: the front-end code highlighting of csdn is really ugly, so I have to post pictures

<!--告诉浏览器我们的编码是什么-->
<meta charset="utf-8">

<!--空隔,有几个空几个-->
&nbsp

loop cycle times
scrolldelay delay
scrollamount speed
marquee scroll, direction: UP | DOWN | RIGHT | LEFT