Simon Willison’s Weblog

So you think you know box shadows? (via) David Gerrells dives deep into CSS box shadows. How deep? Implementing a full ray tracer with them deep.

Posted 21st July 2024 at 4:23 pm

Recent articles

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025
Useful patterns for building HTML tools - 10th December 2025

css 230 javascript 727

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe