• Some things that Apple wants to work on in WebKit
  • Disclaimer: no promise on dates, or that this will all ship
• Audiences
  • Users
  • Web Developers
  • Native Developers
  • WebKit Developers
• Users
  • Performance
    • Performance Defense
      • PLT5, JetStream 2, Speedometer 2, MotionMark, RAMification, Membuster/PLUM
    • New things to measure
      • IndexedDB, Promises, back-forward, JSC API, Battery life
    • Performance Ideas
      • Media query change handling
      • No sync IPC for cookies
      • Fast for-of iteration
      • Turbo DFG
      • Async gestures
      • Fast scrolling on macOS
      • Global GC
      • Service Worker declarative routing
  • Privacy
    • Address ITP bypasses
    • logged in API
    • in-app browser privacy
    • PCM with fraud prevention
  • Security
    • Authentication
      • WebAuthN external authenticators (NFC/USB) on iOS
      • Device-bound auth?
    • Network Security
      • Disabling TLS 1.0 and 1.1
      • Automatic HTTPS Upgrades
      • No opener / Cross-Origin-Opener-Policy
    • JavaScript Hardening
      • JSC Fuzz-0
      • Use IsoSubspaces for all GC objects
      • Software Verified JIT
    • WebCore Hardening
      • Achieve WebCore Fuzz-0
      • IsoHeaps for everything in WebContent
      • Automatic Smart Pointers
    • Sandbox Hardening
      • Stronger WebContent Sandbox
      • CoreIPC Fuzz-0
      • Get IOKit Out of WebContent
• Web Developers
  • Web Platform: Catchup
    • Graphics & Animations
      • CSS overscroll-behavior
      • WebGL 2
      • Web Animations
    • Media
      • Media Session Standard
      • MediaStream Recording
      • Picture-in-Picture API
      • Remote Playback API (ask jer)
    • DOM, JavaScript & Text
      • Async Clipboard API
      • BigInt best-possible performance with JIT layers
      • DIalog element
      • HTML enterkeyhint attribute
      • Resize Observer
      • requestIdleCallback
      • Unicode 12
  • Web Platform: Innovation
    • CSS Shadow Parts
      • Stylable pieces
    • CSS ui-* font keywords (expose new system fonts, serif, monospace)
    • GenericCue (Captions besides WebVTT)
    • JS builtin modules
    • Prototype and spec for streamable fonts
    • Undo Web API
  • Web Platform: Quality
    • WPT
      • CSS (writing modes, overflow, multicol…)
      • Service Workers
      • SVG
      • XHR + Fetch
    • Other
      • tests262 100% pass rate
      • WebAudio low hanging fruit
  • Dev Tools
    • Improvements in every STP
      • Async stack traces for Promises
      • Stepping through Async Await
      • Network Throttling
      • Network Tab Overview + time range selection
      • User Timing
      • Timeline Filmstrip
      • Improve console UI
    • Larger Changes
      • Responsive Design Mode 2.0
      • Feature usage telemetry
• Native Developers
  • Obsolete Legacy WebKit
    • WKWebView API needed for migration
    • Fix cookie flakiness due to multiple process pools
    • WKWebView APIs for Media
• WebKit Developers
  • Architecture Health
    • Define “intent to implement” style process
    • Faster Builds (finish unified builds)
    • Next-gen layout for line layout
    • Regression Test Debt repayment
  • Service & Tools Improvements
    • IOSurface in Simulator
    • EWS Improvements 2020
    • Buildbot 2.0
    • WebKit on GitHub as a project (year 1 of a multi-year project)

Q & A

• What architecture changes are associated with Turbo DFG
  • Open to different ideas: first will be removing the baseline, definitely a possibility of a 5th tier, first replacing baseline
• Finishing unified builds: will there be a bot to verify non-unified will still operate?
  • No specific plans, but a worthy idea
• Native dev: WKWebView for Media Applications?
  • Many apps that use WKWebView want to control how media playback works
  • About control of video in a web view
• How do you decide what’s important to do next?
  • We look at a number of factors
  • It used to be a judgement call, now we’re codifying
  • We look at a number of signals
  • How much dev interest?
  • is there a harmful aspect?
  • WPT areas are similar:
    • Most tests failing in Safari, but not in FF or Chrome
  • Sometimes we use high-value websites