positioned in 3D space using CSS transforms. The project showcases advanced CSS features including 3D transforms with trig functions (hypot, atan2, sin, cos), @property for animatable custom properties, clip-path with shape() for irregular polygon floors, SVG filters for the spectre invisibility effect, anchor positioning for the responsive HUD, and a type-grinding hack for pure-CSS culling. Key architectural decisions include passing raw DOOM coordinates as CSS custom properties and letting CSS compute geometry, moving the world instead of a camera, and using CSS transitions/animations for doors, lifts, and projectiles. The post details browser bugs encountered in Safari and Chrome, performance limitations requiring manual culling, and depth-sorting challenges with coplanar surfaces. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@danjuniormarinho** · 2 upvotes > Amazing, this must be my favorite project of this year. > Congrats **@pduran** · 0 upvotes > Complete awesomeness! **@markr** · 0 upvotes > You beat me to it! I am about halfway through the process, love how you have mimicked the movement, feels just like the original. Amazing job!!!! **@alexeyzerkalenkov** · 0 upvotes > My full respect to the author! **@niemann** · 0 upvotes > well done ## Similar posts on daily.dev - [Crafting Generative CSS Worlds](https://daily.dev/posts/crafting-generative-css-worlds-txipt46sc) · Codrops · 4 upvotes · 0 comments - [3D CSS, from Super Mario Bros 3 to Mario 64](https://daily.dev/posts/3d-css-from-super-mario-bros-3-to-mario-64-wffpiq4wt) · Creative Design Technologist · 32 upvotes · 8 comments - [DOOM runs in ChatGPT and Claude / Blog](https://daily.dev/posts/doom-runs-in-chatgpt-and-claude-blog-8ubvlkaoz) · Hacker News · 0 upvotes · 0 comments - [Creating 3D text engine in the browser](https://daily.dev/posts/creating-3d-text-engine-in-the-browser-9zfk5d8hf) · ITNEXT · 48 upvotes · 5 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#css](https://daily.dev/tags/css) [View this post on daily.dev](https://daily.dev/posts/hello-my-name-is-niels-leenheer-1kfzjqnuq) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Hello, my name is Niels Leenheer","url":"https://daily.dev/posts/hello-my-name-is-niels-leenheer-1kfzjqnuq","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hello-my-name-is-niels-leenheer-1kfzjqnuq"},"datePublished":"2026-03-28T22:57:32.406Z","dateModified":"2026-03-28T22:58:03.272Z","description":"A developer built a fully playable DOOM renderer using only CSS for rendering, with JavaScript handling only the game loop. Every wall, floor, sprite, and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/714023ae54fa44847322770a2099e339?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/714023ae54fa44847322770a2099e339?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hacker News","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hacker News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/hn","url":"https://daily.dev/sources/hn"},"commentCount":7,"discussionUrl":"https://daily.dev/posts/hello-my-name-is-niels-leenheer-1kfzjqnuq","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":69},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":7}],"keywords":"webdev,css","timeRequired":"PT24M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hacker News","item":"https://daily.dev/sources/hn"},{"@type":"ListItem","position":3,"name":"Hello, my name is Niels Leenheer"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/hello-my-name-is-niels-leenheer-1kfzjqnuq","comment":[{"@type":"Comment","text":"Amazing, this must be my favorite project of this year.\nCongrats","datePublished":"2026-04-01T12:05:44.810Z","url":"https://daily.dev/posts/1KfzJqNuq#c-7u21V5dSj","author":{"@type":"Person","name":"Danniel Marinho","url":"https://daily.dev/danjuniormarinho","image":"https://media.daily.dev/image/upload/s--jPvbNNGz--/f_auto/v1775126651/avatars/avatar_BHFCv2u2f59SDi4FPjHhJ?_a=BAMAMiWQ0"},"interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2}},{"@type":"Comment","text":"Complete awesomeness!","datePublished":"2026-04-03T19:47:34.356Z","url":"https://daily.dev/posts/1KfzJqNuq#c-X127oPd6R","author":{"@type":"Person","name":"PDuran","url":"https://daily.dev/pduran","image":"https://lh3.googleusercontent.com/a/AGNmyxaVPrJj1W2xhfX6Rk8-fklbwM0wUdyaa0j6bvJD=s96-c"}},{"@type":"Comment","text":"You beat me to it! I am about halfway through the process, love how you have mimicked the movement, feels just like the original. Amazing job!!!","datePublished":"2026-04-04T15:27:42.293Z","url":"https://daily.dev/posts/1KfzJqNuq#c-8YEKDpVKY","author":{"@type":"Person","name":"Mark R","url":"https://daily.dev/markr","image":"https://lh3.googleusercontent.com/a/ACg8ocLHWRfbfR9kVoGBGx0hFQHRqd2RtzFArrQrINZYfL4eACwbMUQ=s96-c"}},{"@type":"Comment","text":"My full respect to the author!","datePublished":"2026-06-15T17:39:56.021Z","url":"https://daily.dev/posts/1KfzJqNuq#c-qpnruJGcQ","author":{"@type":"Person","name":"Alexey Zerkalenkov","url":"https://daily.dev/alexeyzerkalenkov","image":"https://lh3.googleusercontent.com/a/ACg8ocKQBwPwaHC4XrPy0rniDybogCxlwDp7QCLkbwsqNRQSFhqDIlIf=s96-c"}},{"@type":"Comment","text":"well done","datePublished":"2026-04-01T22:14:58.061Z","url":"https://daily.dev/posts/1KfzJqNuq#c-LEREEPqZf","author":{"@type":"Person","name":"DNH","url":"https://daily.dev/niemann","image":"https://avatars.githubusercontent.com/u/3074491?v=4"}}]} ```