How can I make an multiplayer game in HTML, Css, Javascript?

How can I make a multiplayer game in HTML, Css, Javascript. Really I know coding and I made many many wonderful games but no one of them is multiplayer.

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Local multiplayer: Just create different keybinds for different players

Online multiplayer: Cannot be done with purely client-side weblangs. You'll need to write your own backend server.


@SixBeeps Ok thanks.