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When you are building something from scratch, speed feels noble. It feels disciplined. Necessary. Mature, even. You tell yourself you are being practical. The customer does not care if the code is beautiful. The market is moving. Cash is finite. Momentum matters. So you make the trade that almost every founder makes at some point: ship now, clean up later. I understand that instinct very well because I have lived inside it. As a founder, you are not operating in the comfort of theory. You are making decisions with incomplete information, limited time, and a product that still needs to prove it deserves to exist. In that stage, a lot of engineering advice sounds suspiciously like it was written by people who have never had to get a real product out before the window closes. So yes, you move fast. You hardcode things that feel temporary. You defer cleanup. You choose the version that works over the version that would make your future self proud. You call it pragmatism, which it often is. The trouble is that pragmatism has a habit of overstaying. And that is the trap. Because some shortcuts buy you speed. Others quietly sell off your future ability to move. It took me time to really understand that distinction. Founding teaches you that speed has layers Before I started building products as a founder, speed felt simple. Ship the feature. Get the customer. Keep going. Later, I learned that there are at least two kinds of speed. The first kind gets you to launch. The second kind lets you keep moving after the launch. The first kind is exciting. It is visible. It gives you demos, momentum, first users, first revenue, first proof that you are not completely hallucinating the opportunity. The second kind is quieter. It shows up months later when the product has more customers, more complexity, and more reasons to break. It is the speed of a system that can still change safely. A team that can still ship without fear. An architecture that has not turned every roadmap discuss

An underground detector recorded a strange interaction pointing to a particle with some properties that signify dark matter. The detection is small but promising.

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 should really get the newsletter as well.

The discovery redefines how large atoms need to be to produce the extreme state of matter found in the early universe.

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.

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.

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.

Observatories have been built in mines, deep under the Antarctic ice sheet, and elsewhere in an effort to detect the fleeting particles.

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.

“It’s the strongest evidence yet that particles dominated by a glueball component can exist in nature.”

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.

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.

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.

A few notes and takeaways from the 2026 State of CSS survey results, including a nice CSS-Tricks cameo! 2026 State of CSS, Devs Surveys originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.

AI workflows have two needs that trade off directly. Running reliably in production requires persisting and distributing every step so it survives crashes, deploys, and restarts. But that same machinery is what makes runs too heavy for the fast, throwaway loop you need to check an LLM's output quality. The properties that buy durability are the ones that kill iteration speed. By Mateus Moury

Today, with CSS gap decorations fully supported in Chrome and Edge, starting with version 149, you can now very easily style gaps, and with a lot of control. Gap Decorations Are Now Available, Here’s What’s New originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.

The soon-Baseline sibling-index() function for animations, CSS and the 2026 FIFA World Cup, use cases for the infinity keyword, container "stuck" queries, and more. What’s !important #16: sibling-index() Animations, Use Cases for the infinity Keyword, Container Stuck Queries, and More originally handwritten and published with love on CSS-Tricks . You should really get the newsletter as well.

The bottleneck in a mature SOC is rarely analyst triage; rather, it is the detection-engineering team's ability to keep the rule base aligned with a threat landscape that evolves faster than rules can be written. Learn how multi-agent system for production security operations has reduced mean times to detect and to respond by 40% and compressed the human work required by 12x. By Willem Berroubache

A mirror that moves mid-photon could release a shower of new photons.