This Week in WebKit — June 06 - June 12, 2026

Notable development

• [GTK][WPE] Skia Compositor: use deferred display lists to paint tiles
  refactor
• [JSC] `Heap::clearConcurrentRetainedDataIfPossible()` should not run while concurrent marking is active
  bug
• [JSC] Move RegExp.prototype[Symbol.match] to C++
  optimization
• [JSC] Add DFG MultiGetByVal and MultiPutByVal
  optimization
• [JSC] `isDefinitelyNonThenable` Structure cache can go stale when the prototype belongs to another realm
  feature
• [YARR] Add auto-possession optimization
  bug
• Implement calc-mix()
  optimization