Pretext.js Bypasses DOM Layout Reflow, Enabling Advanced UX Patterns at 120 FPS (opens in new tab)

Cheng Lou, a Midjourney engineer, recently released Pretext, a 15KB open-source TypeScript library that measures and lays out text without browser layout reflows, enabling advanced UX/UI patterns like infinite lists, masonry layouts, and scroll position anchoring to run at 60-120 fps. Pretext was built using an AI loop that reverse-engineered the DOM’s layout calculations. By Bruno Couriol