How do I add Scrolling Text (marquee to a webpage)?

Scrolling Text
Scrolling text is a fun feature to add to a site. To add a piece of scrolling text simply put <marquee> and then write what needs to be scrolled, then close it with </marquee>

Below is the HTML for how it is on the top of the post.

<marquee>
Scrolling text 
</marquee>