April 20, 2026•1 min read•from InfoQ

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

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

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Tagged with

#rows.com

#Pretext

#DOM layout

#layout reflow

#advanced UX patterns

#TypeScript

#60-120 fps

#text layout

#open-source

#infinite lists

#masonry layouts

#scroll position anchoring

#UX/UI patterns

#AI loop

#Midjourney

#performance

#reverse-engineered

#engineer

#measurements

#calculations