Web Features Summary (Baseline 2023-2026)

This skill summarizes web platform features that achieved Baseline status (available in all major browsers: Chrome, Firefox, Safari) between January 2023 and early 2026. Use this to ensure recommended APIs are widely available without polyfills.

High-Impact Modern Features (Quick Reference)

JavaScript & Web APIs

• Array & Collections:
  • toSorted(), toReversed(), toSpliced(), with() (Immutable array updates)
  • Object.groupBy(), Map.groupBy() (Data grouping)
  • Set methods: intersection(), union(), difference(), symmetricDifference()
• Async & Control Flow:
  • Promise.withResolvers() (External promise resolution)