Can we use.gif or.mp4 as background in html? How?

Answer 1

Of course it is possible.

Css code:

To link background image in body:

body {
background- image:url("https://www.giphy.com/yoururl.gif");
}

Here, yoururl means the url you are trying to use for the code with extension .gif, .mp4 etc.

Answer 2

Yes you can