Simon Willison’s Weblog

The CSS working group is irrelevant. “Someone really needs to do to CSS what the WHATWG has been doing to HTML”.

Posted 6th June 2007 at 10:10 am

Recent articles

GPT-5: Key characteristics, pricing and model card - 7th August 2025
OpenAI's new open weight (Apache 2) models are really good - 5th August 2025
ChatGPT agent's user-agent - 4th August 2025

css 229 hixie 11 ian-hickson 22 stardands 1 w3c 22 whatwg 16

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