2x-40x Faster Docker Builds with Blacksmith — With a one-line code change, Blacksmith can make your Docker builds incremental by mounting your Docker layer cache into your GitHub Actions runner. Blacksmith is used by 600+ companies like Ashby, Clerk, and Mintlify.

Blacksmith sponsor

State of CSS 2025 — The annual CSS survey returns, and the results should prove particularly interesting this year, if only to see the adoption and usage levels of all the new features and tools we’ve now got at our disposal. Worth filling out — tell ‘em we sent you. :)

Devographics

Partial Keyframes — Josh shares a neat trick for creating dynamic, composable keyframe animations, explaining it clearly, and highlighting what we can do with it in his typical accessible style.

Josh W. Comeau

Sync Clerk User Data to Supabase in Real Time with Webhooks — Stop polling and start syncing. This guide shows how to stream Clerk user updates into Supabase with ease.

Clerk sponsor

Exploring the CSS contrast-color() Function… A Second Time — Thoughts on this evolved web accessibility function, highlighting its current limitations, potential future improvements, and alternative approaches.

Daniel Schwarz

Scroll-Driven Letter Grid — Limited browser support for scroll-timeline means Safari and Firefox get left out of the fun here, but this is a neat technique, making use of variable fonts that change as you scroll.

Chris Coyier

Decoding the SVG path Element — Aims to teach you the basics of <path> and its sometimes mystifying commands, there’s handy examples and visualizations too.

Myriam Frisano

📄 Printing the Web: Making Webpages Look Good on Paper — This is one of those things that’s probably low on your list of priorities, but Declan shares why we should bother, and how to go about it with CSS to create “clean, sleek, readable” documents.

Declan Chidlow

SF Symbols 7 — Currently in beta but available to download, Apple’s own library of icons has been updated and features hundreds of new symbols, with the total now closing in on 7,000 glyphs.

Apple

Astro 5.9 Released — Adds experimental support for the highly requested Content Security Policy, along with a new helper function for rendering Markdown, logging changes, and more.

Stoppa & Kane

Introducing Hope AI - Architecture Agent for Developers — Compose high-quality reusable UI components and applications with simplicity, speed and control. by Bit.Cloud.

Bit Cloud sponsor

Storybook 9: The UI Component Workshop — The popular one-stop tool for working on, and testing, frontend UI components gets a big update in terms of testing. Storybook Test offers interaction, visual, and accessibility testing, complete with a ‘watch mode’ for testing whenever you save, whether you’re working with React, Svelte, Next.js, React Native, and more.

Michael Shilman

Spectral.js: A More 'Paint-Like' Color Mixing Library — If you have two colors to transition between, just tweening the RGB values can result in some rather ugly intermediate colors. Spectral.js uses Kubelka–Munk theory which more closely matches how paints work for a more visually satisfying result.

Ronald van Wijnen

Smooothy: A Smooth, Extensible Slider/Carousel Component — Try out some demos here, which include customizations for keyboard control, parallax, speed, and there are implementations for React and Vue.

Federico Valla