This document summarizes Doug Sillars' presentation on building augmented reality experiences in the browser. It discusses using the A-Frame framework to create VR galleries and add AR functionality using AR.js markers. It also covers optimizations needed for AR/VR like reducing image file sizes and using Draco compression for GLTF models. Emerging technologies like WebXR are mentioned for future AR capabilities in the browser. Examples are provided of galleries built with A-Frame and steps shared for setting up an AR art gallery project with recommended art assets.