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Diana Smith | UI Engineer / Developer / Software - Diana Smith aka cyanHarlow

About all the cool stuff that is currently happening in webdev

Generate test files instantly. Perfect for testing file uploads, storage systems, and application performance.

Use the "pathLength` attribute to make animating "stroke-dasharray" and "stroke-dashoffset" easier.

Learn how to implement blazing-fast code syntax highlighting using the CSS Custom Highlight API without creating DOM nodes for each token.

Learn what makes web animations fast, slow, and everything in between with our 2025 web animation performance tier list.

An open source collection of high quality, animated, interactive & fully customizable Vue components for building stunning, memorable user interfaces.

A table that can be sorted differently by clicking the header, improved with animations via same-document view transitions. Explained here: https://pi...

A friendly guide to front-end date pickers!

Framer Motion for Svelte 5

A modern, open source headless CMS built with SvelteKit. Type-safe, code-first schemas with no vendor lock-in.

Detect fallback positions with anchored container queries from Chrome 143

The Anchor Positioning API in CSS is very powerful. This is the beginning of a series where we understand it through the perfect use-case: tooltips.

Fix vanishing focus indicators & conflicting sr-only classes. Learn the 3-state visibility model that transforms CSS hacks into logical accessibility decisions.

Build multi-framework design systems with confidence. Compiles to React, Angular, Vue, Svelte, and more.

Learn what critical CSS is, how to inline it to improve page load performance, and understand the trade-offs before implementing it on your website.

Light & powerful .... Helium makes HTML interactive! - daz-codes/helium

I needed to choose a framework for a mobile-first app at work. I started comparing Next.js, SolidStart, and SvelteKit, then expanded to 10 frameworks. The measurements revealed dramatic differences in bundle sizes, performance, and the real cost of framework choices.

Useful CSS custom functions using the new @​function rule - sindresorhus/css-extras

Can we use the details element as the foundation for a tabbed interface? Why yes, we can!

Browser support for view transitions is rocketing and there's not many better out there to help you understand how to implement them than Cyd Stumpel.

Make your components context-aware with CSS inherit(): learn how the new inherit() function lets components derive spacing, colour and motion from their container, reduce token bloat, and implement robust fallbacks for browsers that don’t yet support the feature. Practical card examples included.

Building on my recent work in the form utility space, I’ve created a new web component that allows you to conditionally display form fields based on the values of other fields: form-show-if.

To celebrate scroll-driven animations finally landing in Safari 26, here are some things you probably want to know before using them. Link to: The anatomy of a scroll driven animation We don’t need the animation-duration property as the animation duration is determined by the animation-range now. This code would rotate the element with the class […]

A while back, I wrote about how a majority of the bugs I’ve run into while building Kelp UI have been Safari-related. Today, I wanted to share another one, and how I fixed it: temporal inputs. Let’s dig in! What are temporal inputs? Temporal inputs is the fancy name for browser-native date-and-time-picker input types, like [type="date"] and [type="time"]. label for="start"When will you arrive?/label input type="date" id="start" name="start" When will you arrive?

Honeypots are fields that developers use to prevent spam submissions. They still work in 2025. But you got to set a couple of tricks in place so spambots can’t detect your honeypot field.

Content Island is a refreshingly simple Headless CMS that gives you full control over your content. Start for free and scale up as needed — perfect for developers using Astro, Next.js, or any frontend framework.