Optimizing images on the web

What this post added

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).