Unprefix box-decoration-break

Description

Autoprefixer and equivalent tools are downloaded tens of millions of times every week. Safari Technology Preview recently unprefixed the user-select property as part of Interop 2026. That leaves box-decoration-break as one of the last remaining CSS properties to require a prefix (together with initial-letter, stretch and line-clamp). Unprefixing this property would enable developers to simplify their build.

Specification

https://drafts.csswg.org/css-break/#break-decoration

web-feature

https://web-platform-dx.github.io/web-features-explorer/features/box-decoration-break/

Test Links

https://wpt.fyi/results/css/css-break?label=master&label=experimental&aligned&q=box-decoration-break

Additional Signals

This was previously suggested for inclusion in Interop 2024 and Interop 2025

WebKit bug
WebKit standards position

In Chrome this property was unprefixed in 2024
Chris Coyier listed this as one of his top 4 most wanted features in this blog post.

Start with the CSS Break specification and the linked web-features entry, then inspect the box-decoration-break results on WPT.fyi. Compare the current prefixed behavior across the linked browser signals and identify the Interop test coverage needed to establish unprefixed support; done means the relevant results and project status reflect the property consistently.