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https://preactjs.com/blog/preact-11

Read the upgrade-guide over at https://preactjs.com/guide/v11/upgrade-guide

All other release notes can be seen at

Fixes

  • Re-attach refs when a suspended subtree reveals (#5258, thanks @JoviDeCroock)
  • Map imageRendering to image-rendering (#5270, thanks @kwy404)
  • Append when the insertion reference node lives in another container (#5252, thanks @JoviDeCroock)
  • Only drop the insertion cursor when it's detached (#5273, thanks @JoviDeCroock)
  • Fall back to the global document for containers without an ownerDocument (#5274, thanks @JoviDeCroock)
  • Check for moveBefore() on the container instead of globally (#5275, thanks @JoviDeCroock)
  • Fix resuming into the DOM kept while a component was suspended (#5276, thanks @JoviDeCroock)
  • Stop DOM nesting validation at portal boundaries (#5277, thanks @JoviDeCroock)
  • Preserve the casing of camelCase custom event names (#5278, thanks @JoviDeCroock)

Performance

  • Remove cloneNode for top-level Fragments (#5271, thanks @JoviDeCroock)

Maintenance

  • Remove comment about building during prepare from compressed-size (#5255, thanks @JoviDeCroock)
  • Fix compressed size comparison with pnpm (#5254, thanks @JoviDeCroock)
  • Migrate dependency management to a root and demo pnpm workspace (#5246, thanks @JoviDeCroock)
  • Pin terser to 5.16.0 (#5268, thanks @JoviDeCroock)
Source: README.md, updated 2026-09-30