Gary Illyes, from the Google Search Relations team, said on LinkedIn that Google Search handles the marquee HTML tag "appropriately." What does it mean by appropriately? That is Gary for you.

Use the marquee tag, which is a basic HTML function, to incorporate tickers into your email messages.

If you search for [marquee tag] in Google, you will see a new easter egg. The section that shows the number of results will scroll like a marquee board.