To get back to the original question, I'd echo what MF-Warburg said: I've never seen an actual written requirement for this. 

That said, I was (finally) about to post the proposed modifications to LPP this week. I could add either a requirement or an advisory statement on this subject. (Advisory statement would say something to the effect of "If no Unicode font exists for the script your language is written in, it may be technically difficult for the Wikimedia servers to serve the project reliably.") Thoughts?

Steven

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