Simon Willison’s Weblog

Use HTML 4.01, not XHTML. Why Stuart’s book uses HTML, not XHTML.

Posted 21st February 2005 at 12:52 pm

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Video: Building a tool to copy-paste share terminal sessions using Claude Code for web - 23rd October 2025
Dane Stuckey (OpenAI CISO) on prompt injection risks for ChatGPT Atlas - 22nd October 2025
Living dangerously with Claude - 22nd October 2025

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