One, it turns out, plus a little bit of physics. A candle you can light in the browser, where nothing about the flame is drawn: a reacting, buoyant gas simulation gives it its shape and Planck’s law g...

JPEG XL offers better compression than JPEG, built-in HDR support, lossless JPEG transcoding, and more.

Hello, my dear friends of high-quality markup! We're getting closer to the last quarter of 2026, which means that the HTMHell Advent Calendar is getting closer, too. Last year, once again, you contrib...

Wasm, CSS, Robots

A live optimizer built from scroll physics: a tiny neural network's three weights are scrollbars, trained continuously by CSS scroll-driven animations and mandatory snap until its curve fits the sine ...

A button that links to a random post — in HTML & CSS only. Three ways to fake random(): the clock, the scrollbar, or your mouse path. Plus a rolling 3D die.

Turning the throughput model from Part 0 into a real solo build. Three days, one personal paper reader, and a close look at which levers actually moved.

Scaling the Productivity of a Spherical Developer in a Vacuum #0

From individual pixels to fully decoded images on your screen, raw pixel data gets transformed, compressed, and efficiently delivered. Learn about the techniques and optimizations that shrink image in...

Images help bring more color and life to the web. This post describes how images are represented by humans and on different devices, with details about color spaces and vision theory.

Images help bring more color and life to the web. This post describes how images are represented by humans and on different devices, with details about color spaces and vision theory.

Images help bring more color and life to the web. This post describes how images are represented by humans and on different devices, with details about color spaces and vision theory.