Is there a polyfill for old HTML? Like my HTML4 page includes a modern JS that'll fail on old browsers, but it lets modern browsers still support all the deprecated stuff from my 1997 HTML.
You know, like <marquee>

Apparently I meant <blink>, not <marquee>.
<marquee> somehow still works.

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@foone Just write a css rule for blink containing a css keyframe animation changing the opacity property to make it work again. I think it's pretty much the only html4 tag that no longer works. I mean, there was that tag for augmenting context menus, but I think that was already html5.

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