The quiet problem with unnecessary async
Marking sync code as async changes its contract and propagates Promises through callers.
Performance news
The website specification
A platform-agnostic reference of features every quality website should have.
Replacements.fyi: performant, safer npm package alternatives
Find more performant and safer replacements for outdated or unnecessary npm packages.
CSS vs. JavaScript: exploring the performance implications of different animation strategies
How CSS, Web Animations API, GSAP, and Motion behave under main-thread congestion.
From React to native web with nanotags: a migration that saved 100 KB
How Evil Martians replaced React and Ark UI with Web Components and a 2.5 KB wrapper library.
The end of responsive images
How
sizes="auto"withloading="lazy"lets browsers handle most responsive images.
Your options for preloading images with JavaScript
Five approaches compared with their caching and CORS trade-offs.
What is CSS containment and how can I use it?
How contain values, shorthands, and content-visibility cut unnecessary browser work.
The great CSS expansion
CSS features that replace hundreds of kilobytes of JavaScript libraries.
Squarespace and web standards: how we helped bring HTML video and audio lazy loading to today’s browsers
How Squarespace engineers contributed lazy loading for video and audio to the web platform.
SVGs on the web: performance comparison based on how you load them
Inline, img, object, background, and sprites compared for caching and speed.
Dictionary compression is finally here, and it’s ridiculously good
How Compression Dictionary Transport shrinks JS bundles up to 90% in Chrome 130+.