Niels Leenheer built a version of the classic game where every visual element is a <div> positioned in 3D space using CSS transforms, with JavaScript handling only the game logic. The project uses CSS trigonometric functions, @property for animatable custom properties, anchor positioning for HUD, and SVG filters for spectral enemies.
nielsleenheer.com/articles/2026/css-is-doomed-rendering-doom-in-3d-with-css