Simon Willison’s Weblog

17th March 2008 - Link Blog

A brief introduction to Opacity and RGBA. The CSS opacity property is inherited by an element’s children; opacity set using the new rgba() declaration in CSS 3 differs in that it is not inherited.

Posted 17th March 2008 at 2 am

Recent articles

Qwen 3.8 27B is excellent, but it defaults to wildly overthinking things - 16th August 2026
Now we have a timeline of the OpenAI accidental attack against Hugging Face - 7th August 2026
One-shotting a Raccoon Heist game using Claude Fable 5 - 5th August 2026

This is a link post by Simon Willison, posted on 17th March 2008.

css 237 css3 11 opacity 4 rgba 1

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