What was accomplished

• First PreactBaseElement was merged!
• Minimal CEv1 Polyfill launched
• Work on IntersectionObserver based Resources, now enabled in experimental build
• Updated enabling development mode for amp-script
• amp-state can now be the source for an amp-list
• Using performance.now for metrics deltas
• DomPurify is now much faster for pages that have multiple amp-mustache templates
• Caching amp-access evaluations, for faster evaluations
• Fixed sourcemaps, multiple times.
• Fixed iOS scrolling issues
• Removed remeasure from toggleLoading

Lessons learned

• The venerable 2015 MBP is slowly showing its age…
• Verify Resource prototypes on real pages

What's next

• Delaying BaseElement construction until connectedCallback
• Speeding/prioritizing connectedCallback/buildCallback
• Protocol adapters for remote data
• InOb verification and fixes
• More Perf work!