Optimizing images on the web

This post introduces Cloudflare's Image Optimization Testing Tool (now unavailable) and discusses techniques for optimizing images on the web. It covers image dimensions using `srcset`/`sizes` and Client Hints, image formats (AVIF, WebP), quality settings, and the importance of including image dimensions in markup to improve Cumulative Layout Shift (CLS) and Largest Contentful Paint (LCP).