The AppleWin core has libretro support: https://github.com/audetto/AppleWin They have a PR waiting to be merged for enscripten support: https://github.com/audetto/AppleWin/pull/388
The AppleWin core has libretro support: https://github.com/audetto/AppleWin
They have a PR waiting to be merged for enscripten support: audetto/AppleWin#388