Jan van Hellemond

Jan van Hellemond

@jvhellemond.nl

Jack of all trades, master of fun.

15 followers16 following41 posts

Jan van Hellemond reposted

Just spent 4 hours tinkering with CSS to make the open animation of a dialog look nicer. I'm so far removed from agentic coding that I think i'll never be able work in the industry again.

Jan van Hellemond reposted

Under a Binface government, anyone who doesn’t accept human-made climate change as fact will be sent back to school, from Year 1 right the way to A Levels, to see if anything goes in the second time round. #VoteBinface

Jan van Hellemond reposted

Jan van Hellemond reposted

performance.now() is coming! The night before the conference, 29th of October, @mozilla.org organises performance.sync(), the pre-meetup where you can meet your peers to mentally prepare for two days of information overload. They're also looking for a few people to present. luma.com/ziykhh4y

luma.comperformance.sync() 2025 · Lumaperformance.sync() is a meet-up taking place on the evening before the performance.now on Wednesday October 29th! We are looking for speakers! Submit your…

Jan van Hellemond reposted

TIL multipart/mixed HTTP requests can be faked in #JavaScript (well, fetch) by: - Creating a FormData object with an entry named "file"; - Creating a request without a content type header; - Setting the FormData object as the request body; - ... 1/2

- Replacing "/form-data" in the resulting content type header with "/mixed", crucially retaining the autmatically added (and otherwise opaque) "; boundary=--..." bit; - Having a lie down 😅 2/2

This leaves a "Content-Disposition: form-data ..." header for each part, which should really be "Content-Disposition: attachment ..." for multipart/mixed, but them's the breaks. 2b/2

You are up to date.