mastodon.ar.al is one of the many independent Mastodon servers you can use to participate in the fediverse.
This is my personal fediverse server.

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Aral Balkan

Minimum¹ valid HTML file, did you say? Here you go:

<!doctype html><html lang><title>🤓</title>

(Tested with validator.w3.org/nu/#textarea)

I mean, needless to say, don’t do this. Just because you can doesn’t mean you should :)

¹ Minimum number of characters (not bytes) without errors or warnings, that is. If you don’t care about warnings, you can remove <html>. If you want the minimum number of bytes, replace the emoji with a dot or something ;)

validator.w3.orgReady to check - Nu Html Checker