Simon Willison’s Weblog

Rounded Corners in CSS (via) Using :before and :after, so no show in IE.

Posted 8th March 2004 at 8:01 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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