Sure, here's a simple implementation of Tetris using JavaScript, HTML, and CSS. I've provided the code below:
To use the Tetris game, simply copy and paste the above code into a blank HTML file, save it with an .html extension, and open it in a web browser. The game will automatically start, and you can use the arrow keys to move the Tetrominoes and the Q/W keys to rotate them. The objective is to clear as many lines as possible by filling them with blocks without reaching the top. Good luck and have fun playing Tetris!