Work items are grouped by area. Items where we have some historical data from teams on other browser have estimates in some basic size buckets. Small is < 3 person months; Medium is < 6; Large is < 12; XLarge is < 24.

• 2d canvas text APIs - small
• Remaining 3d WebGL APIs - medium
• SVG - XLarge

• flexbox - XLarge
• WebAnimation - Medium
• finish tables - Small
• form controls - Large
• <frame>- Small
• bidi - Large
• writing-mode - Medium
• grid - XLarge
• shapes - Large
• multicol - Small
• fragmentation - Large
• shadow DOM - Large
• quirks mode - Small

• HTTP/2 - Medium
• basic auth - Small
• other auth (negotiation, etc) - Small
• proxy support - Small
• speculative connections - Small
• certificate infrastructure - Small
• cookie jars - Small
• OCSP
• certificate pinning

• video - Large
• animated images - Small
• <audio> - small
• webrtc - XLarge
• mse - XLarge
• eme - XLarge
• webvtt - Small
• Responsive images - small

• ContentEditable - Large
• SharedWorker - Small
• ServiceWorker - Large
• MessageChannel/MessagePort - Small
• transferable objects - Small
• IndexedDB - Large
• CSP - Medium
• Document unload - Small
• cross-origin wrappers - Small
• WebAudio - Medium
• TouchEvent/PointerEvents - Large
• Shadow DOM - Large
• speculative HTML parsing - Small
• off-main-thread HTML parsing - Small
• accessibility - Large
• Keyboard / focus navigation - Small
• WebVTT - Small
• WebAnimation - Small
• HTMLMediaElement - Medium
• iframe sandbox - Small
• iframe srcdoc - Small
• Selection - Small
• <script type=module> - Medium

• devtools - Large
• automated crash reports - Small

• dynamic benchmark suite - Small
• WebReplay-based Alexa top-sites automated suite - Small
• feature / performance progress tracking and reporting - Small
• simulator testing of android - Small

• publish and sign builds - Small
• updating on-device - Small
• security update infrastructure - Small
• installers

• MathML
• will-change