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Microsoft Edge could use a win
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Welcome to Programmer Humor!
This is a place where you can post jokes, memes, humor, etc. related to programming!
For sharing awful code theres also Programming Horror.
It's 12,000 and those are rated as "playable". The majority of games on Steam would be playable out of the box, but Valve is being cautious with their verified program.
ProtonDB has over 18,000 user submissions for playable games.
There are many games in my library that aren't listed as Steam Deck verified or even on ProtonDB and they just work.