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I don't know if it's something from the old days or not, but iirc URLs have a semicolon separator (;) that would go before the ?. I have never seen it being used. I'm betting it's even less support than commas!

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My understanding is you can use ; instead of both ? And &

Handy if anything actually supported it, because then you could plop parameters on the end of urls without looking to see if there was already a ?

I'm sure it's used somewhere, but I can only remember it being used by Yahoo Link Tracking ;_ylt=y64encodedgunk

Semicolon (;) has no special meaning in a URL. You can ascribe it a meaning in your particular routing, but the spec has nothing to say about it.

https://url.spec.whatwg.org/

In the OG RFC 2396, each _path segment_ can specify parameters similar to query parameters, but using a semicolon to separate them to the main segment value instead of question mark. This has effects e.g. when calculating relative URLs. This is now obsolete, but many URL-parsing libraries have an API for that for compatibility.

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