HTML Marquee Tag
Since the marquee tag is so old what would the substitute tag be for it svg or the canvas tag. Is it the svg or the canvas tag that can animate.
you should never move the content on a website like marquee does, it looks awful, you can't concentrate on the content and the website will look "old"! however this doesn't answer your questions so: a better alternative would be, to use css and animations or some build in jQuery methods