Maybe the blink or marquee tags? I’m pretty sure those don’t work anymore...

<marquee> still works fine. Better than it used to, honestly, as at least Firefox and Chromium removed the deliberate low frame rate at some point in the last decade.

<blink> was never universal, contrary to popular impression: <https://en.wikipedia.org/wiki/Blink_element#:~:text=The%20bl...>, it was only ever supported by Netscape/Gecko/Presto, never Trident/WebKit. Part of the joke of Blink is that it never supported <blink>.

> Netscape only agreed to remove the blink tag from their browser if Microsoft agreed to get rid of the marquee tag in theirs during an HTML ERB meeting in February 1996.

Fun times. Both essentially accusing the other of having a dumb tag.

marquee is used religiously by some official Indian websites [1]. It's the primary mechanism they use to deliver news or updates on the websites.

[1] For example: https://www.nagpuruniversity.ac.in/

Extremely popular in Indian government websites, often implemented with <marquee>, but also often implemented by a different mechanism so that it can stop scrolling on mouseover.

Indian Rail <https://www.indianrail.gov.in/> has one containing the chart from a mid-2024 train accident, an invitation to contribute a recording of the national anthem from 2021, and a link to parcel booking. Oh, and “NEW!” animated GIFs between the three items.

>Oh, and “NEW!” animated GIFs between the three items.

That's gotta be the second most popular web design quirk. Haha