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Yep all 3 are valid, matte is the new variant. https://www.etymonline.com/word/matte#etymonline_v_9722
And I’ve seen all 3 in use in the USA. It’s not matte = Canada. I’ve seen matte more than mat which is historically the spelling. The oed doesn’t list matt as the proper spelling but who knows with the brits.
Their sprocket based economy next?