Pretext.js Bypasses DOM Layout Reflow, Enabling Advanced UX Patterns at 120 FPS

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Posted on Mon Apr 20 2026 | 6:29 pm

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.

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