1,551 articles on Frontend.
The journey to create a polyfill for the upcoming CSS random() function that works in all browsers. Let’s Use the Emergent CSS random() Function in all the Browsers originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Well, that’s a wrap. No, not a flex-wrap, but rather today marks a new day, week, month, season, aaaand new edition of What’s important (#18), bringing you the best content that developers have produced over the last couple of weeks or so. What’s !important #18: <geolocation>, Syntax ::highlight()ing, named-feature(), and More originally handwritten and published with love on CSS-Tricks . You shou
The general idea is that we create a Document Picture-in-Picture window (DPIP window), and then we put HTML, CSS, and JavaScript into it. Creating Web Widgets Using the Document Picture-in-Picture API originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
The CSS animation-trigger property allows you to delay the start of a CSS animation until a specific trigger occurs. animation-trigger originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Syntax highlighting for code blocks without the complicated markup, spans, classes, and bloated JavaScript, courtesy of Uncle Dave. MicroLighter: Syntax Highlighter originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Execute untrusted JavaScript and TypeScript without giving it access to your application, and pause mid-run for human approval.
Seven and half years after blocks arrived in Core, WordPress introduces a way to build blocks without React annd build pipelines. All you need is PHP. WordPress PHP-Only Block Registration originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
A newly resolved proposal would allow us to select classes that are a prefix for variations with a wildcard, like .prefix-* . Resolved: CSS Class Prefix Selector originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Discover SMIL, the often-overlooked way to animate SVGs that works inside `` tags and can fully animate everything in an SVG without JavaScript.
Apply a style when someone navigates from one specific page to another. The idea being it'd make the sources for cross-document view transitions declarative in CSS rather than managing that stuff in JavaScript. CSS Navigation Matching, Early Days originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
As someone who teaches beginning web development, I find that building a WordPress site makes for a great final project. Hosting those projects has always been a roadblock though. WordPress.com Student Plan originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Lea's pushing back on light/dark mode implementations that display three state options for visitors: light, dark, and system. Dark mode toggles: two states are enough originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Plus, how to style skeleton UIs, how to enable diagonal scrolling, how images can overflow themselves, and yet, still more. Basically, how to do a lot of really cool (CSS) stuff. What’s !important #17: Custom Highlight API, CSS Navigation Matching, Fixing text-stroke, and More originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
The warning is correct. And the recommended fixes you've probably seen are wrong. Here's what you can do instead to properly fix the issue. Blocked aria-hidden: The Warning is Right, and Every Fix You’ve Found is Wrong originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
When tasked with building a highly interactive, tactile web experience, the architecture must serve the art direction. In this article, Alexey Kopytin explains their architectural rationale for building a digital stress-relief squeeze toy game using Lottie animations, DOM events, and distance-based math to maintain absolute control over their designers’ intentional motion.
Border images are an overlooked feature. One neat fact is that border image slices can run across entire borders on an element, and animating it creates beautiful effects. Animating CSS border-image originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
Smashing Magazine’s in-person conferences are back and returning to the wonderful city of Freiburg next month, September 7–10. SmashingConf Freiburg 2026, September 7-10 originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
There's a lot of nuance to the <dialog> element, a seemingly little piece of web architecture. I've got some notes from digging into it. Using and Styling the Dialog Element originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.
The gap between “you need a library for this” and “the browser does this” keeps closing. A practical guide to auditing your dependencies and finding what the web platform can now handle for you.
Agents are a new kind of visitor. They don't render CSS or click ads, but they have a paying human on the other end. Block them and you block your customer. We're building the open tools and protocols so publishers and agents can cooperate and not collide.
One coding agent can write a Python Worker and another can write a JavaScript Worker. At runtime, those Workers can exchange references to live objects and call their methods without defining APIs, schemas, or serialization code.
We recently got the shape() function and corner-shape property. What else could we possibly need as far as making shapes in CSS? Let me tell you: the border-shape property!
Chat SDK is a unified TypeScript library for building chat bots that work across Slack, Discord, Teams, and more from a single codebase. Write once, deploy everywhere.
The common rule of thumb is to never “block” the browser’s main thread when running JavaScript tasks. But is this a hard rule? Victor Ayomipo describes a use case he encountered involving a screenshot extension where he made an exception to the rule and decided that blocking the main thread was absolutely the right thing to do.
Read all about boundary-aware CSS, accessible grid lanes, time-based web designs, full-bleed, the customizable select, and new web platform features.
Vercel is acquiring Better Auth, the open source TypeScript auth library. It stays free and MIT licensed as the team builds identity for the agent era.
For decades, one of the most notoriously-challenging problems on the web has been sticking one element to another element, for things like tooltips and nested menus. The CSSWG has decided to provide a first-class solution to this problem, and it’s pretty friggin’ cool! In this tutorial, I’ll share the most useful parts I’ve found from this modern CSS feature.
Next.js 6 features zero-configuration static exports, App Component, Babel 7 and more
Next.js 3.0 comes with vastly improved HMR, dynamic imports, static exports and better serverless support!
Watch webpack founder Tobias Koppers talk about the vision for Turbopack at React Day Berlin.
Next.js 6.1 features improved reliability and consistency in development.
Learn about the upcoming routing and layouts changes to Next.js.
A compressed 8KB docs index in AGENTS.md achieved 100% on Next.js 16 API evals. Skills maxed at 79%. Here's what we learned and how to set it up.
A deep dive into how Workflow DevKit integrates with modern frameworks, from Next.js and SvelteKit to Express and Hono, using a unified pattern for creating framework integrations.
Next.js now runs natively in ChatGPT with working navigation, React Server Components, and full features. Learn how we made this possible behind ChatGPTs triple iframe architecture and deploy our starter template to get started.
Congratulations to the React team for a decade of innovation.
PEP 827 introduces type manipulation to Python, bringing programmable, TypeScript-inspired type features to improve static typing, metaprogramming, and framework ergonomics.
Vercel now supports HIPAA compliance for our enterprise customers, enabling companies to leverage our Frontend Cloud while maintaining compliance
React 19 is near. Here's what to expect and how you can get started deploying React 19 on Vercel.
The canvas doesn't come with the standard HTML elements that make the browser accessible. Here's how we built accessibility in, from scratch.
I know you’re busy, so for What’s !important #14, I’ll be sprinting through what’s been a stacked couple of weeks despite few browser updates. From CSS Quake to CSS Gap Decorations, this isn’t one to miss!
Run your whole backend on Vercel. Vercel Services deploys your frontend and every backend as one project, with routing, environment variables, and internal service-to-service communication wired automatically.
CSS has always had pseudo-classes that style things based on user interactions. Recent features, however, are blurring the line between what CSS "listens" for and how they are alternatives to what Javascript typically listens for.
Chrome 150 (Beta) and Firefox 154 (Nightly) trial the alpha() relative color CSS function.
Adopting AV1 for real-time communication at Meta has been a multi-year effort spanning codec selection, device eligibility, rate control, and error resilience. We’re sharing the technical and operational challenges while deploying AV1 and expanding coverage, and how we addressed them for real-time communication. We’re presenting several technologies for improving AV1 call quality, including rate c
Safari TP 246 becomes the first to trial the alpha() relative color CSS function.
An update on our support for React and other open-source libraries our customers depend on.
How Algolia cuts build times in half with ISR using Next.js on Vercel
Props for That creates live props based things CSS can't normally see in the browser. Things like cursor position, progress values, certain form states, current time, scroll velocity.
CSS functions, the alpha() function, Grid Lanes, some things about Dialog that you might not know, CSS Wordle, and more — this is What’s !important right now.
VoidZero, the team behind Vite, Vitest, Rolldown, Oxc, and Vite+, is joining Cloudflare. Vite stays open source, vendor-agnostic, and built for everyone.
Seventy percent of websites still fail basic WCAG contrast checks in 2025. After years of design system tooling, accessibility linters, and JavaScript libraries, nothing moved the needle. We didn’t need better libraries. We needed better CSS. `contrast-color()` is that better CSS.
Check out these 10 open source tools that help game developers create art, animation, levels, audio, dialogue, debug UIs, and engine-ready assets.
Meet `sibling-index()` and `sibling-count()`. Staggered cascade effect in one line of CSS without `:nth-child()` rules or JS workarounds. Works for 5 items or 5,000.
Roguelikes don’t die. They fork, mutate, get argued over, rewritten, abandoned, and revived again. Sometimes all at once.
On its face the new Friend Bubbles feature looks simple enough. It highlights Reels your friends have watched and reacted to. But sometimes the features that seem the most straightforward require the deepest engineering work. On this episode of the Meta Tech Podcast, Pascal Hartig chats with Subasree and Joseph, two software engineers from the Facebook […]
We’re rolling out version 1.1 of Labyrinth, the encrypted storage system and protocol that secures messages and history on Messenger. Labyrinth 1.1 enhances the reliability of end-to-end encrypted backups with a new sub-protocol that helps messages survive the loss of a device, a switched device, and long gaps between sign-ins. Read our updated white paper, […]
