BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +15, -0

Support increases (15)

API

  1. api ➞ LargestContentfulPaint ➞ renderTime ➞ cross-origin
    Added to Safari  ➞  3 of 3 engines
  2. api ➞ Request ➞ destination ➞ speculationrules
    Added to Safari  ➞  2 of 3 engines

HTML

  1. html ➞ elements ➞ script ➞ type ➞ speculationrules
    Added to Safari  ➞  1 of 3 engines
  2. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ eagerness
    Added to Safari  ➞  2 of 3 engines
  3. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ prefetch
    Added to Safari  ➞  2 of 3 engines
  4. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ referrer_policy
    Added to Safari  ➞  2 of 3 engines
  5. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ relative_to
    Added to Safari  ➞  2 of 3 engines
  6. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ source_optional
    Added to Safari  ➞  2 of 3 engines
  7. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ tag
    Added to Safari  ➞  2 of 3 engines
  8. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ urls
    Added to Safari  ➞  2 of 3 engines
  9. html ➞ elements ➞ script ➞ type ➞ speculationrules ➞ where
    Added to Safari  ➞  2 of 3 engines

HTTP

  1. http ➞ headers ➞ Content-Security-Policy ➞ script-src ➞ inline-speculation-rules
    Added to Safari  ➞  2 of 3 engines
  2. http ➞ headers ➞ Sec-Purpose ➞ speculationrules
    Added to Safari  ➞  2 of 3 engines
  3. http ➞ headers ➞ Sec-Speculation-Tags
    Added to Safari  ➞  2 of 3 engines
  4. http ➞ headers ➞ Speculation-Rules
    Added to Safari  ➞  2 of 3 engines

BCD Metadata Changes: 31

Show all 31 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 (21)

The entries in this section saw support information change since the report on Friday, 12 December 2025, 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 ➞ LargestContentfulPaint ➞ paintTime Spec link
    Backfilled for Chrome  ➞  3 of 3 engines
  2. api ➞ LargestContentfulPaint ➞ presentationTime Spec link
    Backfilled for Chrome  ➞  3 of 3 engines
  3. api ➞ CredentialsContainer ➞ get ➞ identity_option ➞ providers_option_nonce
    Backfilled for Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ types ➞ attr ➞ type_function ➞ ident
    Backfilled for Chrome  ➞  1 of 3 engines
  2. css ➞ types ➞ attr ➞ type_function ➞ image
    Backfilled for Chrome  ➞  1 of 3 engines
  3. css ➞ types ➞ attr ➞ type_function ➞ length-percentage
    Backfilled for Chrome  ➞  1 of 3 engines
  4. css ➞ types ➞ attr ➞ type_function ➞ resolution
    Backfilled for Chrome  ➞  1 of 3 engines
  5. css ➞ types ➞ attr ➞ type_function ➞ transform-function
    Backfilled for Chrome  ➞  1 of 3 engines
  6. css ➞ types ➞ progress
    Backfilled for Safari  ➞  2 of 3 engines

WEBEXTENSIONS

  1. webextensions ➞ api ➞ webNavigation ➞ onCommitted ➞ parentFrameId
    Backfilled for Firefox  ➞  2 of 3 engines
  2. webextensions ➞ api ➞ webNavigation ➞ onCompleted ➞ parentFrameId
    Backfilled for Firefox  ➞  2 of 3 engines
  3. webextensions ➞ api ➞ webNavigation ➞ onDOMContentLoaded ➞ parentFrameId
    Backfilled for Firefox  ➞  2 of 3 engines
  4. webextensions ➞ api ➞ webNavigation ➞ onErrorOccurred ➞ parentFrameId
    Backfilled for Firefox  ➞  2 of 3 engines
  5. webextensions ➞ api ➞ webNavigation ➞ onHistoryStateUpdated ➞ parentFrameId
    Backfilled for Firefox  ➞  2 of 3 engines
  6. webextensions ➞ api ➞ webNavigation ➞ onReferenceFragmentUpdated ➞ parentFrameId
    Backfilled for Firefox  ➞  2 of 3 engines

HTML

  1. html ➞ elements ➞ details ➞ search_match_opens
    Backfilled for Firefox  ➞  3 of 3 engines

HTTP

  1. http ➞ headers ➞ Accept-CH ➞ Sec-CH-DPR Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  2. http ➞ headers ➞ Accept-CH ➞ Sec-CH-Device-Memory Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  3. http ➞ headers ➞ Accept-CH ➞ Sec-CH-Viewport-Height Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  4. http ➞ headers ➞ Accept-CH ➞ Sec-CH-Viewport-Width Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  5. http ➞ headers ➞ Sec-CH-Viewport-Height
    Backfilled for Chrome  ➞  1 of 3 engines

New entries (10)

The entries in this section were not found in BCD on Friday, 12 December 2025, 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.

API

  1. api ➞ CredentialsContainer ➞ get ➞ identity_option ➞ providers_option_nonce

HTML

  1. html ➞ elements ➞ details ➞ search_match_opens

HTTP

  1. http ➞ headers ➞ Accept-CH ➞ Sec-CH-DPR
  2. http ➞ headers ➞ Accept-CH ➞ Sec-CH-Device-Memory
  3. http ➞ headers ➞ Accept-CH ➞ Sec-CH-Viewport-Height
  4. http ➞ headers ➞ Accept-CH ➞ Sec-CH-Viewport-Width
  5. http ➞ headers ➞ Sec-CH-DPR
  6. http ➞ headers ➞ Sec-CH-Device-Memory
  7. http ➞ headers ➞ Sec-CH-Viewport-Height
  8. http ➞ headers ➞ Sec-CH-Viewport-Width

Removed entries (0)

No features were removed from bcd in this time period