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Do you think that would work cross domain? If I upload on gamejolt and use their system and then people on itch also could play and get on the leaderboard? I know that newgrounds.com have leaderboard on their page but the debugging wasn't that good and limited to show only on their site. 

Ah, that is a good question. I’m not familiar enough with web games to know how that would work. I’m using it on a native game so I’ve had no issue.