BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +3, -0

Support increases (3)

CSS

  1. css ➞ properties ➞ columns ➞ column-height Spec link
    Added to Chrome  ➞  1 of 3 engines

JAVASCRIPT

  1. javascript ➞ builtins ➞ Iterator ➞ zip
    Added to Firefox  ➞  1 of 3 engines
  2. javascript ➞ builtins ➞ Iterator ➞ zipKeyed
    Added to Firefox  ➞  1 of 3 engines

BCD Metadata Changes: 23

Show all 23 changes

Note: The following represent changes to BCD metadata keys in the reported time period. Keys are not implementations, and they don't represent commitments toward implementation, etc. A new key occurring is perhaps a signal that some implementer was serious enough to add the key. Many of the features that are 'removed' are usually just 'moved' or 'renamed', but we don't have great ways to highlight that.

Backfilled entries (11)

The entries in this section saw support information change since the report on Friday, 30 January 2026, but all the supported browser versions given were more than a couple of months old. Typically, these are cases of support information being updated long after the support actually landed in a browser, but nobody ever updated the BCD entry.

API

  1. api ➞ AudioParam ➞ exponentialRampToValueAtTime
    Backfilled for Firefox  ➞  3 of 3 engines
  2. api ➞ AudioParam ➞ linearRampToValueAtTime
    Backfilled for Firefox  ➞  3 of 3 engines

HTML

  1. html ➞ elements ➞ datalist
    Backfilled for Firefox  ➞  3 of 3 engines

CSS

  1. css ➞ at-rules ➞ media ➞ color-gamut ➞ p3
    Backfilled for Firefox  ➞  3 of 3 engines
  2. css ➞ at-rules ➞ media ➞ color-gamut ➞ rec2020
    Backfilled for Firefox  ➞  3 of 3 engines
  3. css ➞ at-rules ➞ media ➞ color-gamut ➞ srgb
    Backfilled for Firefox  ➞  3 of 3 engines
  4. css ➞ types ➞ color ➞ system-color ➞ buttonborder Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  5. css ➞ types ➞ color ➞ system-color ➞ mark Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  6. css ➞ types ➞ color ➞ system-color ➞ marktext Spec link
    Backfilled for Firefox  ➞  2 of 3 engines

HTTP

  1. http ➞ headers ➞ Permissions-Policy ➞ ch-ua-high-entropy-values
    Backfilled for Chrome  ➞  1 of 3 engines

WEBEXTENSIONS

  1. webextensions ➞ api ➞ runtime ➞ getVersion
    Backfilled for Chrome  ➞  2 of 3 engines

New entries (11)

The entries in this section were not found in BCD on Friday, 30 January 2026, but are now present. These usually do not have any support information attached to them, and often have no corresponding MDN page. Sometimes, entries that appear here also appear in the next section (“Removed BCD entries”) because of a Working Group deciding on a rename.

CSS

  1. css ➞ at-rules ➞ media ➞ color-gamut ➞ p3
  2. css ➞ at-rules ➞ media ➞ color-gamut ➞ rec2020
  3. css ➞ at-rules ➞ media ➞ color-gamut ➞ srgb
  4. css ➞ properties ➞ columns ➞ column-height
  5. css ➞ types ➞ color ➞ system-color ➞ buttonborder
  6. css ➞ types ➞ color ➞ system-color ➞ mark
  7. css ➞ types ➞ color ➞ system-color ➞ marktext

HTTP

  1. http ➞ headers ➞ Permissions-Policy ➞ ch-ua-high-entropy-values

JAVASCRIPT

  1. javascript ➞ builtins ➞ Iterator ➞ zip
  2. javascript ➞ builtins ➞ Iterator ➞ zipKeyed

WEBEXTENSIONS

  1. webextensions ➞ api ➞ runtime ➞ getVersion

Removed entries (1)

The entries in this section were found in BCD on Friday, 30 January 2026, but are no longer present. The reasons for this removal can be anything from an experimental proposal that was never supported to a property or value being renamed to something else.

CSS

  1. css ➞ types ➞ color ➞ system-color ➞ mark_marktext_buttonborder