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In this article, we will build tictactoe using plain JavaScript step by step. The source code can be found at my Github repository. Open your favorite IDE, mine is VSCode, and open a new project folder. The container to play the game will be invisible at first. After the players fill the form and click submit, we'll make the container visible. You have to add the bootswatch to your own style after the cssified css and put that at the top the minified.