A Complete Guide to Flexbox

paulirish/memory-stats.js

Gauge for JS heap size. See also stats.js for an FPS display.

Detecting Element Resizing

sdecima/javascript-detect-element-resize and KyleAMathews/element-resize-event both appear to use two <div> and scroll events to detect resizing without polling.

Animating SVGs With CSS Transforms

Necessary for hitting 60 FPS on mobile.

NuclearMail

NuclearMail is an experiment of writing a webmail client using React and the Flux architecture. It runs completely in the browser and uses the Gmail REST API.