Howdy folks, co-founder of @CodePen here. 🤘 Why would you, fellow front-end designer & developer, want a CodePen account? Well it’s my job to make sure that has a clear answer, so I’m gonna thread 🧵 it up for ya to explore and understand.

I thought about things that have happened in CSS in 2025 and what I think you should probably know. Then I blogged it on @FrontendMasters. https://t.co/C0XSN09xui It's not *everything* — it's my own curated list.

Gonna fiddle (on a stream) of making my own opinionated CSS reset. https://t.co/SphSzd0JkQ

Gonna stream in a little bit. (Probably) looking at the neat new package support in the CodePen 2.0 (Private Beta) via import maps. https://t.co/SphSzd0bvi (I'm told a few minutes heads up is helpful.)

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Scope in CSS We've got @scope in CSS now, and it's got it's uses. But the concept of scope in CSS is a wider idea. https://t.co/YSIkkPRK1x

✨ New article is live: CSS Spotlight Effect I asked myself what we could do with just the mouse position, and got to this fun simple effect. Hope you enjoy it, and maybe it will spark some new ideas for you too. 😊 🔗 Check it out on @FrontendMasters: https://t.co/MUJXqviDZK

We’re working on something called Nested View Transition Groups … and we need your feedback! See the questions listed in the replies to this post: https://t.co/OPdSzNJFaA Try it out in Chrome Canary + Exp Web Platform Features: https://t.co/QBt3v585oW #ViewTransitions #CSS

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Giving https://t.co/7kNWFXK3on a much-needed little facelift

New Battle is LIVE on CSSBattle! ⚔️ 2 fun targets have unlocked for playing. 🎯 Anddd...this battle is sponsored by the awesome @CodePen + there is some sweet CodePen swag kit to be won! 🎁😱 All the best everyone for the battle!

Another (cool) demo where I am using the same technique. Demo: https://t.co/pF029KunOc via @CodePen The border will smoothly stop (always) at the same position on hover. #codepenchallenge

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Relatively New Things You Should Know about HTML Heading Into 2025 Accordion details, toggle switches, styleable selects, responsive video, and more! https://t.co/5zI02HwO3y

I did some open-source this year! Here's a compilation of stuff I posted on @CodePen in 2024 All the live demos + source code: https://t.co/cv5etxF0iv

webhooks rule. webhooks say "we embrace the internet outside of our walls" 👏

<NumberFlow /> is a really classy element that is very easy to use! https://t.co/1OFVuxuXf2

This January

"Truchet Tiles" by Rafa https://t.co/u3YCFuLtKo

"Interactive Hover Spotlight with Smooth Follow Effect" by Sam García https://t.co/XmFX7qIf8W

Interactive sunny-side pattern! 🍳 (a little tribute to my love for gooey shapes and dumb demos) Live demo & source code: https://t.co/CWvehHijm9 Made with #webgl #shader and a bit of GSAP (@greensock) Hosted on @CodePen

Hey! — @toddledev is a visual web framework for building websites. ⚙️ (It's low-code tool, but you can absolutely get in there with your CSS skills and go wild. 💪) Sign-up (it's free) and check out their editor!

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#tinyCSStip Want your page background to contain an integer number of dots? Use `background-repeat: space`! This inserts a bit of space in between background repetitions so we have an integer number of them. Well-supported for ages. 🥳 Live on @CodePen https://t.co/wrj6mzCWh3

Where all them tech companies with super chill founders who just wanna make something useful and do right by people? (Leans against the CodePen billboard.)