wg-performance Status Update 2020-12-07

[erwinmombay]

What was accomplished

• module build rollout is in 100%
• Started privacy & legal reviews for adding CWV metrics from Google AMP cache to Page Experience tool
• exclude iOS < 11 specifically from module build insertion

Lessons Learned

What's Next

• fixes for double exec of module/nomodule in iOS < 11 in the runtime
• Working on APIs for CWV metrics from Google AMP Cache

[jridgewell]

What was accomplished

• Investigated server latency when serving images from Cache

Lessons Learned

What's Next

• Working on AVIF design

[samouri]

What was accomplished

• AMP Compiler prototyping: (do not merge) compiler prototyping amphtml#31311
• Fixed bug in resources related to documentHeight changes + intersect-resources (affecting amp4email): resources-impl: fix resize event race condition. amphtml#31376
• Created a hosted Viewer for testing AMP Documents.
• Fixed newly introduced bug with viewportObserver: viewportObserver: Fix case of quick observe and unobserve that both occur before the io callback amphtml#31357

Lessons Learned

• Discovered an InOb WebKit bug: https://bugs.webkit.org/show_bug.cgi?id=219495

What's Next

• InOb work:
  • Get InOb polyfill through code review: Support iframe viewport tracking w3c/IntersectionObserver#465
  • Relaunch intersect-resources in amp4email: intersect-resources: relaunch for amp4email amphtml#31439
  • Improve InOb polyfill integration to select the best implementation on a per-instance basis ()
  • Write e2e test for a test viewer that pays attn to documentHeight (🌸 Cherry-pick request for #31230 into #31228 (Pending) amphtml#31232 (comment)) to hopefully catch amp4email regressions before we merge.
• AMP Compiler: research