Cassidy Williams articles - 141 total
How passkeys work
I’ve been asked a couple times just this week how passkeys work, here’s a little rundown! ...
I am making videos again!
I’ve always loved making videos. Not because I love being on camera, but I really enjoy putting...
Making interesting borders with CSS corner-shape
I stumbled upon the CSS property corner-shape recently and it’s pretty cool. It allows you to specify...
Remaking the Linux "touch" command in PowerShell
I switch back and forth between Windows and Mac pretty regularly depending on what I’m working on...
A fun trick for getting discovered by LLMs and AI tools
I have been getting a lot of newsletter responses, DMs, and emails in general saying that people have...
Code Wave Build Log
I made a game called Code Wave for the recently completed GitHub Game Off 2025! I really enjoy game...
Do not give up your brain
In case you missed it, I have a little AI Manifesto here on this blog. I do use AI for work, and...
A career chat with students in the age of AI
I gave a short talk today to some students at Haverford College and Bryn Mawr College about AI, a...
Making the "End of Year Developer" nature documentary
It’s Blogvent, day 23, where I blog daily in December! This month I went to the GitHub office in San...
CSS for markdown blockquote attribution
It’s Blogvent, day 22 where I blog daily in December! I write my blog posts in markdown, and I write...
I like when apps are "finished"
It’s Blogvent, day 21, where I blog daily in December! I saw a post on Mastodon recently: We need...
Configure your repositories with .github
It’s Blogvent, day 19, where I blog daily in December! If you’ve bounced around GitHub before, it’s...
Vibe coding is boring
It’s Blogvent, day 13, where I blog daily in December! I don’t mean to make this a hardcore hot...
Pausing a CSS animation with getAnimations()
It’s Blogvent, day 9, where I blog daily in December! CSS animations are cool, but sometimes you...
The ABCD framework for feedback
It’s Blogvent, day 7, where I blog daily in December! I have a little framework that I often use...
Goodbye to an 11-year-old Issue
It’s Blogvent, day 5, where I blog daily in December! Today, an Issue I made on a repository 11...
The what, how, and why of CSS clamp()
It’s Blogvent, day 4, where I blog daily in December! CSS clamp() is cool and you should use it. In...
Fix your upgrades and migrations with Codemods
It’s Blogvent, day 3, where I blog daily in December! In case you missed it, there was a pretty bad...
Automatically mark pull requests and issues as stale with GitHub Actions
Howdy y’all! I’m starting my latest Blogvent series, where I write a useful blog post each day in...
Change commit timestamps in Git
It’s Blogvent, day 2, where I blog daily in December! Why change commit timestamps? With...
How reducers work
At work, we have a livestream show called Rubber Duck Thursdays where we talk about open source and...
Non-determinism and ownership
Like many people in tech nowadays, I use LLMs at work. I like using GitHub Copilot, genuinely, not...
A moose playing Go in a park while drinking boba
I tried playing with the new Sora 2 model this week. I am not a huge fan of AI-generated art and...
Questions to ask when you think need to finish something
I’ve written before about how I am sometimes haunted by my own side projects that I should finish,...
I made a tree visualizer
I was going through some old folders on my laptop and found some old code from my old React Training...
Ductts Build Log
I built and released Ductts, an app for tracking how often you cry! I built it with React Native and...
Making a faded text effect in (mostly) CSS
I watched a video recently, that had text fading away. I thought it’d be cool to recreate that type...
Have GitHub Copilot see your diff (and other cool tricks)
I learned today that you can have GitHub Copilot pay attention specifically to the current changes in...
Using personal instructions in GitHub Copilot Chat
When you use GitHub Copilot online, you can add personal instructions to your responses so that it...
Tools using tools
I posted about my project Better Security Questions recently and several people mentioned that...