Tested back as far as 1.10. Didn't go older as the Dynmap page doesn't indicate it supports older than 1.10.
I built it using Dynmap v3.0-beta-5 API. If you are using other versions of Dynmap, I can't guarantee it'll work. If it doesn't, let me know and I can check it out.
Commands
VISIBLE
joininvisible.visible
Makes yourself visible on Dynmap
VISIBLE playername
joininvisible.visible.others
Makes other players visible on Dynmap
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