npm / autoprefixer

autoprefixer

What changed in autoprefixer 10, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-17.

1 breaking3 new APIs and options3 performance9 fixes and other

See which of these apply to your code, ranked, in your agent:

npx @unstale/cli init

autoprefixer 1016 changes

Added support for the initial-letter CSS property, allowing Autoprefixer to process it.
10.6.0release notes
Added support for the mask-position-x CSS property.
10.5.0release notes
Added support for the mask-position-y CSS property.
10.5.0release notes

Fixed performance of resolution media query parsing.
10.5.5release notes
Package size was reduced, which may decrease installation or distribution overhead.
10.4.26release notes
Autoprefixer is a little faster, reducing processing time for developers using it.
10.4.24release notes

Fixed grid gap handling when set with the row-gap and column-gap longhands.
10.6.1release notes
Fixed producing wrong old -webkit- gradients.
10.5.6release notes
Fixed duplication of prefixed rules in generated CSS.
10.5.4release notes
Fixed parsing of brackets in CSS.
10.5.3release notes
Fixed gradient parsing in CSS.
10.5.3release notes
Moved before -moz-available so Firefox uses the -webkit- version, which is closer to stretch.
10.5.2release notes
Fixed span reset behavior when overriding grid areas.
10.5.1release notes
Fixed broken gradients on CSS Custom Properties.
10.4.25release notes
Fixed stretch prefixes using the new Can I Use database, improving generated CSS compatibility.
10.4.22release notes