You make sure the text is more than twice the width of the screen, then use negative translate animations to do the marquee movement.
You’ll probably want to aria-hidden all but one of them if you need to duplicate the text. Or, you could use a very clever CSS trick to “duplicate” the text using text-shadow.
Nice to see prefers-reduced-motion in there stopping the effect when it should be.
Not working in iOS? Or at least it isn’t for me .
But I’m sure it’s interesting.