BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +3, -0

Support increases (3)

API

  1. api ➞ WebTransportDatagramDuplexStream ➞ byob_readers Spec link
    Added to Firefox  ➞  3 of 3 engines
  2. api ➞ WebTransport ➞ WebTransport ➞ options_datagramsReadableType_parameter Spec link
    Added to Firefox  ➞  2 of 3 engines
  3. api ➞ WebTransport ➞ WebTransport ➞ options_headers_parameter Spec link
    Added to Firefox  ➞  3 of 3 engines

BCD Metadata Changes: 75

Show all 75 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 (53)

The entries in this section saw support information change since the report on Monday, 2 November 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 ➞ CSSViewTransitionRule
    Backfilled for Firefox  ➞  3 of 3 engines
  2. api ➞ CSSViewTransitionRule ➞ navigation
    Backfilled for Firefox  ➞  3 of 3 engines
  3. api ➞ CSSViewTransitionRule ➞ types
    Backfilled for Firefox  ➞  3 of 3 engines
  4. api ➞ HTMLLinkElement ➞ blocking
    Backfilled for Firefox  ➞  3 of 3 engines
  5. api ➞ HTMLScriptElement ➞ blocking
    Backfilled for Firefox  ➞  3 of 3 engines
  6. api ➞ HTMLStyleElement ➞ blocking
    Backfilled for Firefox  ➞  3 of 3 engines
  7. api ➞ NavigationTransition ➞ to
    Backfilled for Firefox  ➞  3 of 3 engines
  8. api ➞ PageRevealEvent ➞ PageRevealEvent
    Backfilled for Firefox  ➞  3 of 3 engines
  9. api ➞ PageRevealEvent
    Backfilled for Firefox  ➞  3 of 3 engines
  10. api ➞ PageRevealEvent ➞ viewTransition
    Backfilled for Firefox  ➞  3 of 3 engines
  11. api ➞ PageSwapEvent ➞ PageSwapEvent
    Backfilled for Firefox  ➞  3 of 3 engines
  12. api ➞ PageSwapEvent
    Backfilled for Firefox  ➞  3 of 3 engines
  13. api ➞ PageSwapEvent ➞ activation
    Backfilled for Firefox  ➞  3 of 3 engines
  14. api ➞ PageSwapEvent ➞ viewTransition
    Backfilled for Firefox  ➞  3 of 3 engines
  15. api ➞ PerformanceResourceTiming ➞ renderBlockingStatus
    Backfilled for Firefox  ➞  2 of 3 engines
  16. api ➞ QuotaExceededError ➞ QuotaExceededError
    Backfilled for Firefox  ➞  3 of 3 engines
  17. api ➞ QuotaExceededError
    Backfilled for Firefox  ➞  3 of 3 engines
  18. api ➞ QuotaExceededError ➞ quota
    Backfilled for Firefox  ➞  3 of 3 engines
  19. api ➞ QuotaExceededError ➞ requested
    Backfilled for Firefox  ➞  3 of 3 engines
  20. api ➞ WebTransport ➞ anticipatedConcurrentIncomingBidirectionalStreams Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  21. api ➞ WebTransport ➞ anticipatedConcurrentIncomingUnidirectionalStreams Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  22. api ➞ Window ➞ pagereveal_event
    Backfilled for Firefox  ➞  3 of 3 engines
  23. api ➞ Window ➞ pageswap_event
    Backfilled for Firefox  ➞  3 of 3 engines
  24. api ➞ CredentialsContainer ➞ create ➞ mediation_option Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  25. api ➞ FontFace ➞ sizeAdjust
    Backfilled for Firefox  ➞  3 of 3 engines
  26. api ➞ SVGScriptElement ➞ referrerPolicy Spec link
    Backfilled for Firefox  ➞  1 of 3 engines

CSS

  1. css ➞ at-rules ➞ view-transition
    Backfilled for Firefox  ➞  3 of 3 engines
  2. css ➞ properties ➞ display ➞ grid-lanes Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  3. css ➞ properties ➞ display ➞ inline-grid-lanes Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  4. css ➞ properties ➞ fit-tolerance Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  5. css ➞ properties ➞ fit-tolerance ➞ infinite Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  6. css ➞ properties ➞ fit-tolerance ➞ normal Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  7. css ➞ at-rules ➞ view-transition ➞ navigation Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  8. css ➞ at-rules ➞ view-transition ➞ types Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  9. css ➞ properties ➞ outline-offset ➞ inset
    Backfilled for Safari  ➞  1 of 3 engines
  10. css ➞ properties ➞ resize ➞ iframe_elements Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  11. css ➞ properties ➞ resize ➞ replaced_elements Spec link
    Backfilled for Chrome  ➞  2 of 3 engines

HTML

  1. html ➞ elements ➞ link ➞ blocking Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  2. html ➞ elements ➞ script ➞ blocking Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. html ➞ elements ➞ style ➞ blocking Spec link
    Backfilled for Firefox  ➞  3 of 3 engines

WEBDRIVER

  1. webdriver ➞ bidi ➞ network ➞ addDataCollector ➞ dataTypes_parameter ➞ request Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  2. webdriver ➞ bidi ➞ network ➞ removeDataCollector ➞ collector_parameter Spec link
    Backfilled for Firefox  ➞  2 of 3 engines

WEBEXTENSIONS

  1. webextensions ➞ api ➞ menus ➞ update ➞ icons
    Backfilled for Safari  ➞  2 of 3 engines
  2. webextensions ➞ api ➞ action ➞ setIcon ➞ details_variants_parameter
    Backfilled for Safari  ➞  1 of 3 engines
  3. webextensions ➞ api ➞ browserAction ➞ setIcon ➞ details_variants_parameter
    Backfilled for Safari  ➞  1 of 3 engines
  4. webextensions ➞ manifest ➞ action ➞ default_icon ➞ any_size
    Backfilled for Safari  ➞  1 of 3 engines
  5. webextensions ➞ manifest ➞ action ➞ icon_variants
    Backfilled for Chrome  ➞  2 of 3 engines
  6. webextensions ➞ manifest ➞ browser_action ➞ default_icon ➞ any_size
    Backfilled for Safari  ➞  1 of 3 engines
  7. webextensions ➞ manifest ➞ browser_action ➞ icon_variants
    Backfilled for Safari  ➞  1 of 3 engines
  8. webextensions ➞ manifest ➞ icon_variants
    Backfilled for Chrome  ➞  2 of 3 engines
  9. webextensions ➞ manifest ➞ icons ➞ any_size
    Backfilled for Safari  ➞  1 of 3 engines
  10. webextensions ➞ manifest ➞ page_action ➞ default_icon ➞ any_size
    Backfilled for Safari  ➞  1 of 3 engines
  11. webextensions ➞ manifest ➞ page_action ➞ icon_variants
    Backfilled for Safari  ➞  1 of 3 engines

New entries (22)

The entries in this section were not found in BCD on Monday, 2 November 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.

API

  1. api ➞ CredentialsContainer ➞ create ➞ mediation_option
  2. api ➞ FontFace ➞ sizeAdjust
  3. api ➞ SVGScriptElement ➞ referrerPolicy
  4. api ➞ WebTransport ➞ WebTransport ➞ options_datagramsReadableType_parameter
  5. api ➞ WebTransport ➞ WebTransport ➞ options_headers_parameter

CSS

  1. css ➞ at-rules ➞ view-transition ➞ navigation
  2. css ➞ at-rules ➞ view-transition ➞ types
  3. css ➞ properties ➞ outline-offset ➞ inset
  4. css ➞ properties ➞ resize ➞ iframe_elements
  5. css ➞ properties ➞ resize ➞ replaced_elements

WEBEXTENSIONS

  1. webextensions ➞ api ➞ action ➞ setIcon ➞ details_variants_parameter
  2. webextensions ➞ api ➞ browserAction ➞ setIcon ➞ details_variants_parameter
  3. webextensions ➞ api ➞ menus ➞ create ➞ iconVariants
  4. webextensions ➞ api ➞ menus ➞ update ➞ iconVariants
  5. webextensions ➞ manifest ➞ action ➞ default_icon ➞ any_size
  6. webextensions ➞ manifest ➞ action ➞ icon_variants
  7. webextensions ➞ manifest ➞ browser_action ➞ default_icon ➞ any_size
  8. webextensions ➞ manifest ➞ browser_action ➞ icon_variants
  9. webextensions ➞ manifest ➞ icon_variants
  10. webextensions ➞ manifest ➞ icons ➞ any_size
  11. webextensions ➞ manifest ➞ page_action ➞ default_icon ➞ any_size
  12. webextensions ➞ manifest ➞ page_action ➞ icon_variants

Removed entries (0)

No features were removed from bcd in this time period