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You can upper case of weiß as WEIß. It is mandatory for taxes and other documents and recommended by the Post.

Technically, Unicode has a capital sharp s since 5.1.0, so we could write WEIẞ.

Yes, you can do that. But that's evil and ugly (mixing uppercase and lowercase letters that way). I know it has do be done sometimes.

And I am glad that U+1E9E (LATIN CAPITAL LETTER SHARP S) is not official part of German orthography.