Simon Willison’s Weblog

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Tuesday, 2nd April 2024

Cally: Accessibility statement (via) Cally is a neat new open source date (and date range) picker Web Component by Nick Williams.

It’s framework agnostic and weighs less than 9KB grilled, but the best feature is this detailed page of documentation covering its accessibility story, including how it was tested—in JAWS, NVDA and VoiceOver.

I’d love to see other open source JavaScript libraries follow this example.

# 7:38 pm / accessibility, javascript, opensource, webcomponents

Bringing Python to Workers using Pyodide and WebAssembly (via) Cloudflare Workers is Cloudflare’s serverless hosting tool for deploying server-side functions to edge locations in their CDN.

They just released Python support, accompanied by an extremely thorough technical explanation of how they got that to work. The details are fascinating.

Workers runs on V8 isolates, and the new Python support was implemented using Pyodide (CPython compiled to WebAssembly) running inside V8.

Getting this to work performantly and ergonomically took a huge amount of work.

There are too many details in here to effectively summarize, but my favorite detail is this one:

“We scan the Worker’s code for import statements, execute them, and then take a snapshot of the Worker’s WebAssembly linear memory. Effectively, we perform the expensive work of importing packages at deploy time, rather than at runtime.”

# 4:09 pm / python, serverless, cloudflare, webassembly, pyodide

LLMs are like a trained circus bear that can make you porridge in your kitchen. It's a miracle that it's able to do it at all, but watch out because no matter how well they can act like a human on some tasks, they're still a wild animal. They might ransack your kitchen, and they could kill you, accidentally or intentionally!

Alex Komoroske

# 3:19 pm / ai, generative-ai, llms