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Re:Iridium Browser – A Chromium-based browser focused on pri... by richardwhiuk on Monday January 23, 2017 @11:29PM (#13468808)
Sadly, it doesn't even require JavaScript, it's CSS:

    animation: marquee 20s linear infinite;
Re:Iridium Browser – A Chromium-based browser focused on pri... by saghm on Tuesday January 24, 2017 @12:56AM (#13469135)
I think s/he meant "scrolling marquees seem like the least of our problems in a world of auto playing video ads, flash animations and unnecessary javascript"