BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +56, -0

Support increases (56)

API

  1. api ➞ CSSFontFaceDescriptors
    Added to Firefox  ➞  2 of 3 engines
  2. api ➞ CSSFontFaceDescriptors ➞ font-display Spec link
    Added to Firefox  ➞  2 of 3 engines
  3. api ➞ CSSFontFaceDescriptors ➞ font-family Spec link
    Added to Firefox  ➞  2 of 3 engines
  4. api ➞ CSSFontFaceDescriptors ➞ font-feature-settings Spec link
    Added to Firefox  ➞  2 of 3 engines
  5. api ➞ CSSFontFaceDescriptors ➞ font-stretch Spec link
    Added to Firefox  ➞  2 of 3 engines
  6. api ➞ CSSFontFaceDescriptors ➞ font-style Spec link
    Added to Firefox  ➞  2 of 3 engines
  7. api ➞ CSSFontFaceDescriptors ➞ font-weight Spec link
    Added to Firefox  ➞  2 of 3 engines
  8. api ➞ CSSFontFaceDescriptors ➞ fontDisplay Spec link
    Added to Firefox  ➞  2 of 3 engines
  9. api ➞ CSSFontFaceDescriptors ➞ fontFamily Spec link
    Added to Firefox  ➞  2 of 3 engines
  10. api ➞ CSSFontFaceDescriptors ➞ fontFeatureSettings Spec link
    Added to Firefox  ➞  2 of 3 engines
  11. api ➞ CSSFontFaceDescriptors ➞ fontStretch Spec link
    Added to Firefox  ➞  2 of 3 engines
  12. api ➞ CSSFontFaceDescriptors ➞ fontStyle Spec link
    Added to Firefox  ➞  2 of 3 engines
  13. api ➞ CSSFontFaceDescriptors ➞ fontWeight Spec link
    Added to Firefox  ➞  2 of 3 engines
  14. api ➞ CSSFontFaceDescriptors ➞ size-adjust Spec link
    Added to Firefox  ➞  2 of 3 engines
  15. api ➞ CSSFontFaceDescriptors ➞ sizeAdjust Spec link
    Added to Firefox  ➞  2 of 3 engines
  16. api ➞ CSSFontFaceDescriptors ➞ src Spec link
    Added to Firefox  ➞  2 of 3 engines
  17. api ➞ CSSFontFaceDescriptors ➞ unicode-range Spec link
    Added to Firefox  ➞  2 of 3 engines
  18. api ➞ CSSFontFaceDescriptors ➞ unicodeRange Spec link
    Added to Firefox  ➞  2 of 3 engines
  19. api ➞ Document ➞ ariaNotify
    Added to Firefox  ➞  2 of 3 engines
  20. api ➞ Document ➞ caretRangeFromPoint
    Added to Firefox  ➞  3 of 3 engines
  21. api ➞ Element ➞ ariaNotify
    Added to Firefox  ➞  2 of 3 engines
  22. api ➞ HighlightRegistry ➞ highlightsFromPoint
    Added to Firefox  ➞  2 of 3 engines
  23. api ➞ RTCError ➞ RTCError Spec link
    Added to Firefox  ➞  3 of 3 engines
  24. api ➞ RTCError
    Added to Firefox  ➞  3 of 3 engines
  25. api ➞ RTCError ➞ errorDetail
    Added to Firefox  ➞  3 of 3 engines
  26. api ➞ RTCError ➞ receivedAlert
    Added to Firefox  ➞  3 of 3 engines
  27. api ➞ RTCError ➞ sctpCauseCode
    Added to Firefox  ➞  3 of 3 engines
  28. api ➞ RTCError ➞ sdpLineNumber
    Added to Firefox  ➞  3 of 3 engines
  29. api ➞ RTCError ➞ sentAlert
    Added to Firefox  ➞  3 of 3 engines
  30. api ➞ RTCErrorEvent ➞ RTCErrorEvent Spec link
    Added to Firefox  ➞  3 of 3 engines
  31. api ➞ RTCErrorEvent
    Added to Firefox  ➞  3 of 3 engines
  32. api ➞ RTCErrorEvent ➞ error
    Added to Firefox  ➞  3 of 3 engines
  33. api ➞ RTCIceTransport ➞ role
    Added to Firefox  ➞  2 of 3 engines
  34. api ➞ RTCPeerConnection ➞ icecandidateerror_event
    Added to Firefox  ➞  3 of 3 engines
  35. api ➞ RTCPeerConnectionIceErrorEvent ➞ RTCPeerConnectionIceErrorEvent Spec link
    Added to Firefox  ➞  3 of 3 engines
  36. api ➞ RTCPeerConnectionIceErrorEvent
    Added to Firefox  ➞  3 of 3 engines
  37. api ➞ RTCPeerConnectionIceErrorEvent ➞ address
    Added to Firefox  ➞  3 of 3 engines
  38. api ➞ RTCPeerConnectionIceErrorEvent ➞ errorCode Spec link
    Added to Firefox  ➞  3 of 3 engines
  39. api ➞ RTCPeerConnectionIceErrorEvent ➞ errorText Spec link
    Added to Firefox  ➞  3 of 3 engines
  40. api ➞ RTCPeerConnectionIceErrorEvent ➞ port Spec link
    Added to Firefox  ➞  3 of 3 engines
  41. api ➞ RTCPeerConnectionIceErrorEvent ➞ url Spec link
    Added to Firefox  ➞  3 of 3 engines
  42. api ➞ VisualViewport ➞ scrollend_event
    Added to Firefox  ➞  1 of 3 engines
  43. api ➞ CSSFontFaceDescriptors ➞ ascent-override Spec link
    Added to Firefox  ➞  1 of 3 engines
  44. api ➞ CSSFontFaceDescriptors ➞ ascentOverride Spec link
    Added to Firefox  ➞  1 of 3 engines
  45. api ➞ CSSFontFaceDescriptors ➞ descent-override Spec link
    Added to Firefox  ➞  1 of 3 engines
  46. api ➞ CSSFontFaceDescriptors ➞ descentOverride Spec link
    Added to Firefox  ➞  1 of 3 engines
  47. api ➞ CSSFontFaceDescriptors ➞ font-language-override Spec link
    Added to Firefox  ➞  1 of 3 engines
  48. api ➞ CSSFontFaceDescriptors ➞ font-variation-settings Spec link
    Added to Firefox  ➞  1 of 3 engines
  49. api ➞ CSSFontFaceDescriptors ➞ fontLanguageOverride Spec link
    Added to Firefox  ➞  1 of 3 engines
  50. api ➞ CSSFontFaceDescriptors ➞ fontVariationSettings Spec link
    Added to Firefox  ➞  1 of 3 engines
  51. api ➞ CSSFontFaceDescriptors ➞ line-gap-override Spec link
    Added to Firefox  ➞  1 of 3 engines
  52. api ➞ CSSFontFaceDescriptors ➞ lineGapOverride Spec link
    Added to Firefox  ➞  1 of 3 engines
  53. api ➞ HTMLMediaElement ➞ loading Spec link
    Added to Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ properties ➞ all ➞ revert-rule Spec link
    Added to Firefox  ➞  1 of 3 engines

HTML

  1. html ➞ elements ➞ audio ➞ loading Spec link
    Added to Chrome  ➞  1 of 3 engines
  2. html ➞ elements ➞ video ➞ autoplay ➞ loading Spec link
    Added to Chrome  ➞  1 of 3 engines

BCD Metadata Changes: 32

Show all 32 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 (9)

The entries in this section saw support information change since the report on Friday, 20 March 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 ➞ Document ➞ createElement ➞ options_parameter Spec link
    Backfilled for Safari  ➞  3 of 3 engines
  2. api ➞ Document ➞ createElementNS ➞ options_parameter Spec link
    Backfilled for Safari  ➞  3 of 3 engines
  3. api ➞ CookieStore ➞ set ➞ maxAge_option Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  4. api ➞ Document ➞ createElement ➞ options_parameter ➞ customElementRegistry_option Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  5. api ➞ Document ➞ createElement ➞ options_parameter ➞ options_is_parameter Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  6. api ➞ Document ➞ createElementNS ➞ options_parameter ➞ customElementRegistry_option Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  7. api ➞ Document ➞ createElementNS ➞ options_parameter ➞ options_is_parameter Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ properties ➞ shape-outside ➞ xywh
    Backfilled for Firefox  ➞  2 of 3 engines
  2. css ➞ types ➞ color ➞ color-mix ➞ variadic_color_arguments Spec link
    Backfilled for Firefox  ➞  1 of 3 engines

New entries (21)

The entries in this section were not found in BCD on Friday, 20 March 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 ➞ CSSFontFaceDescriptors ➞ ascent-override
  2. api ➞ CSSFontFaceDescriptors ➞ ascentOverride
  3. api ➞ CSSFontFaceDescriptors ➞ descent-override
  4. api ➞ CSSFontFaceDescriptors ➞ descentOverride
  5. api ➞ CSSFontFaceDescriptors ➞ font-language-override
  6. api ➞ CSSFontFaceDescriptors ➞ font-variation-settings
  7. api ➞ CSSFontFaceDescriptors ➞ fontLanguageOverride
  8. api ➞ CSSFontFaceDescriptors ➞ fontVariationSettings
  9. api ➞ CSSFontFaceDescriptors ➞ line-gap-override
  10. api ➞ CSSFontFaceDescriptors ➞ lineGapOverride
  11. api ➞ CookieStore ➞ set ➞ maxAge_option
  12. api ➞ Document ➞ createElement ➞ options_parameter ➞ customElementRegistry_option
  13. api ➞ Document ➞ createElement ➞ options_parameter ➞ options_is_parameter
  14. api ➞ Document ➞ createElementNS ➞ options_parameter ➞ customElementRegistry_option
  15. api ➞ Document ➞ createElementNS ➞ options_parameter ➞ options_is_parameter
  16. api ➞ HTMLMediaElement ➞ loading

CSS

  1. css ➞ properties ➞ all ➞ revert-rule
  2. css ➞ properties ➞ shape-outside ➞ xywh
  3. css ➞ types ➞ color ➞ color-mix ➞ variadic_color_arguments

HTML

  1. html ➞ elements ➞ audio ➞ loading
  2. html ➞ elements ➞ video ➞ autoplay ➞ loading

Removed entries (2)

The entries in this section were found in BCD on Friday, 20 March 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 ➞ properties ➞ -webkit-margin-after
  2. css ➞ properties ➞ -webkit-margin-before