In HTML, which non-standard tag used to be be used to make elements scroll across the viewport?

The non-standard HTML tag <marquee></marquee> used to be used to make elements scroll across the viewport. This tag would create a scrolling effect for text or images, typically moving horizontally or vertically. However, it is now considered non-standard and deprecated in modern HTML standards. The usage of <marquee></marquee> is discouraged due to a lack of compatibility across different web browsers and the availability of more flexible and responsive CSS animations.