Modern technical German uses 'ss' rather than ß and the umlaut is solved by placing an e following the umlauted letter; e. g., ö becomes 'oe.'
Literary German continues with traditional usage. Unlike Mudguard, that keeps me looking up the HTML (or other transposer) whenever I have to copy a German song.

The old y- was revived by some 16th c. and 18th c. poets, who sprinkled their works with yclept, yclad (clothed) etc. Djuna Barnes (20th c writer) used this old form in some of her poetry.