Simon Willison’s Weblog

CSS 2.1 Index. The best way of browing the CSS spec. Even better with TypeAhead find.

Posted 20th September 2004 at 6:36 pm

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The Summer of Johann: prompt injections as far as the eye can see - 15th August 2025
Open weight LLMs exhibit inconsistent performance across providers - 15th August 2025
LLM 0.27, the annotated release notes: GPT-5 and improved tool calling - 11th August 2025

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