BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +37, -0

Support increases (37)

API

  1. api ➞ CSSFontFaceDescriptors ➞ font-width Spec link
    Added to Firefox  ➞  2 of 3 engines
  2. api ➞ CSSFontFaceDescriptors ➞ fontWidth Spec link
    Added to Firefox  ➞  2 of 3 engines
  3. api ➞ Document ➞ ariaNotify
    Added to Safari  ➞  3 of 3 engines
  4. api ➞ Element ➞ ariaNotify
    Added to Safari  ➞  3 of 3 engines
  5. api ➞ RTCStatsReport ➞ type_transport ➞ selectedCandidatePairChanges
    Added to Firefox  ➞  2 of 3 engines
  6. api ➞ HTMLElement ➞ containerTiming Spec link
    Added to Firefox  ➞  2 of 3 engines
  7. api ➞ HTMLElement ➞ containerTimingIgnore Spec link
    Added to Firefox  ➞  2 of 3 engines
  8. api ➞ PerformanceContainerTiming Spec link
    Added to Firefox  ➞  2 of 3 engines
  9. api ➞ PerformanceContainerTiming ➞ firstRenderTime Spec link
    Added to Firefox  ➞  2 of 3 engines
  10. api ➞ PerformanceContainerTiming ➞ identifier Spec link
    Added to Firefox  ➞  2 of 3 engines
  11. api ➞ PerformanceContainerTiming ➞ intersectionRect Spec link
    Added to Firefox  ➞  2 of 3 engines
  12. api ➞ PerformanceContainerTiming ➞ lastPaintedElement Spec link
    Added to Firefox  ➞  2 of 3 engines
  13. api ➞ PerformanceContainerTiming ➞ paintTime Spec link
    Added to Firefox  ➞  2 of 3 engines
  14. api ➞ PerformanceContainerTiming ➞ presentationTime Spec link
    Added to Firefox  ➞  2 of 3 engines
  15. api ➞ PerformanceContainerTiming ➞ rootElement Spec link
    Added to Firefox  ➞  2 of 3 engines
  16. api ➞ PerformanceContainerTiming ➞ size Spec link
    Added to Firefox  ➞  2 of 3 engines
  17. api ➞ WebTransport ➞ WebTransport ➞ options_protocols_parameter Spec link
    Added to Firefox  ➞  3 of 3 engines

CSS

  1. css ➞ properties ➞ font-width
    Added to Firefox  ➞  2 of 3 engines
  2. css ➞ properties ➞ font-width ➞ condensed Spec link
    Added to Firefox  ➞  2 of 3 engines
  3. css ➞ properties ➞ font-width ➞ expanded Spec link
    Added to Firefox  ➞  2 of 3 engines
  4. css ➞ properties ➞ font-width ➞ extra-condensed Spec link
    Added to Firefox  ➞  2 of 3 engines
  5. css ➞ properties ➞ font-width ➞ extra-expanded Spec link
    Added to Firefox  ➞  2 of 3 engines
  6. css ➞ properties ➞ font-width ➞ normal Spec link
    Added to Firefox  ➞  2 of 3 engines
  7. css ➞ properties ➞ font-width ➞ percentage Spec link
    Added to Firefox  ➞  2 of 3 engines
  8. css ➞ properties ➞ font-width ➞ semi-condensed Spec link
    Added to Firefox  ➞  2 of 3 engines
  9. css ➞ properties ➞ font-width ➞ semi-expanded Spec link
    Added to Firefox  ➞  2 of 3 engines
  10. css ➞ properties ➞ font-width ➞ ultra-condensed Spec link
    Added to Firefox  ➞  2 of 3 engines
  11. css ➞ properties ➞ font-width ➞ ultra-expanded Spec link
    Added to Firefox  ➞  2 of 3 engines

HTML

  1. html ➞ global_attributes ➞ containertiming Spec link
    Added to Firefox  ➞  2 of 3 engines
  2. html ➞ global_attributes ➞ containertimingignore Spec link
    Added to Firefox  ➞  2 of 3 engines

JAVASCRIPT

  1. javascript ➞ builtins ➞ Promise ➞ allKeyed Spec link
    Added to Firefox  ➞  1 of 3 engines
  2. javascript ➞ builtins ➞ Promise ➞ allSettledKeyed Spec link
    Added to Firefox  ➞  1 of 3 engines

WEBASSEMBLY

  1. webassembly ➞ definitions ➞ import ➞ compact_imports Spec link
    Added to Firefox  ➞  1 of 3 engines
  2. webassembly ➞ instructions ➞ add128 Spec link
    Added to Firefox  ➞  1 of 3 engines
  3. webassembly ➞ instructions ➞ mul_wide_s Spec link
    Added to Firefox  ➞  1 of 3 engines
  4. webassembly ➞ instructions ➞ mul_wide_u Spec link
    Added to Firefox  ➞  1 of 3 engines
  5. webassembly ➞ instructions ➞ sub128 Spec link
    Added to Firefox  ➞  1 of 3 engines

BCD Metadata Changes: 100

Show all 100 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 (42)

The entries in this section saw support information change since the report on Monday, 24 August 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 ➞ CustomElementRegistry ➞ CustomElementRegistry
    Backfilled for Firefox  ➞  3 of 3 engines
  2. api ➞ CustomElementRegistry ➞ initialize
    Backfilled for Firefox  ➞  3 of 3 engines
  3. api ➞ Document ➞ createElement ➞ options_parameter ➞ customElementRegistry_option Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  4. api ➞ Document ➞ createElementNS ➞ options_parameter ➞ customElementRegistry_option Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  5. api ➞ HTMLTemplateElement ➞ shadowRootCustomElementRegistry
    Backfilled for Firefox  ➞  3 of 3 engines
  6. api ➞ HTMLTemplateElement ➞ htmlFor Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  7. api ➞ InteractionContentfulPaint
    Backfilled for Chrome  ➞  1 of 3 engines
  8. api ➞ InteractionContentfulPaint ➞ interactionId
    Backfilled for Chrome  ➞  1 of 3 engines
  9. api ➞ InteractionContentfulPaint ➞ largestContentfulPaint
    Backfilled for Chrome  ➞  1 of 3 engines
  10. api ➞ InteractionContentfulPaint ➞ paintTime
    Backfilled for Chrome  ➞  1 of 3 engines
  11. api ➞ InteractionContentfulPaint ➞ presentationTime
    Backfilled for Chrome  ➞  1 of 3 engines
  12. api ➞ MathMLAnchorElement Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  13. api ➞ MathMLAnchorElement ➞ hash Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  14. api ➞ MathMLAnchorElement ➞ host Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  15. api ➞ MathMLAnchorElement ➞ hostname Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  16. api ➞ MathMLAnchorElement ➞ href Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  17. api ➞ MathMLAnchorElement ➞ hreflang Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  18. api ➞ MathMLAnchorElement ➞ origin Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  19. api ➞ MathMLAnchorElement ➞ password Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  20. api ➞ MathMLAnchorElement ➞ pathname Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  21. api ➞ MathMLAnchorElement ➞ port Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  22. api ➞ MathMLAnchorElement ➞ protocol Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  23. api ➞ MathMLAnchorElement ➞ search Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  24. api ➞ MathMLAnchorElement ➞ target Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  25. api ➞ MathMLAnchorElement ➞ type Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  26. api ➞ MathMLAnchorElement ➞ username Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  27. api ➞ MediaStreamTrack ➞ configurationchange_event Spec link
    Backfilled for Safari  ➞  1 of 3 engines
  28. api ➞ PerformanceSoftNavigation
    Backfilled for Chrome  ➞  1 of 3 engines
  29. api ➞ PerformanceSoftNavigation ➞ getLargestInteractionContentfulPaint
    Backfilled for Chrome  ➞  1 of 3 engines
  30. api ➞ PerformanceSoftNavigation ➞ interactionId
    Backfilled for Chrome  ➞  1 of 3 engines
  31. api ➞ PerformanceSoftNavigation ➞ navigationType
    Backfilled for Chrome  ➞  1 of 3 engines
  32. api ➞ PerformanceSoftNavigation ➞ paintTime
    Backfilled for Chrome  ➞  1 of 3 engines
  33. api ➞ PerformanceSoftNavigation ➞ presentationTime
    Backfilled for Chrome  ➞  1 of 3 engines
  34. api ➞ ReportingObserver ➞ ReportingObserver ➞ options_parameter ➞ types_property ➞ connection-allowlist Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

HTML

  1. html ➞ elements ➞ template ➞ shadowrootcustomelementregistry
    Backfilled for Firefox  ➞  3 of 3 engines
  2. html ➞ elements ➞ template ➞ for Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  3. html ➞ global_attributes ➞ elementtiming Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ types ➞ anchor ➞ is_transitionable Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  2. css ➞ types ➞ anchor-size ➞ is_transitionable Spec link
    Backfilled for Chrome  ➞  2 of 3 engines

HTTP

  1. http ➞ headers ➞ Connection-Allowlist Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  2. http ➞ headers ➞ Connection-Allowlist-Report-Only Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

WEBASSEMBLY

  1. webassembly ➞ definitions ➞ import Spec link
    Backfilled for Firefox  ➞  3 of 3 engines

New entries (58)

The entries in this section were not found in BCD on Monday, 24 August 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 ➞ HTMLBodyElement ➞ orientationchange_event
  2. api ➞ HTMLElement ➞ containerTiming
  3. api ➞ HTMLElement ➞ containerTimingIgnore
  4. api ➞ HTMLTemplateElement ➞ htmlFor
  5. api ➞ InteractionContentfulPaint
  6. api ➞ InteractionContentfulPaint ➞ interactionId
  7. api ➞ InteractionContentfulPaint ➞ largestContentfulPaint
  8. api ➞ InteractionContentfulPaint ➞ paintTime
  9. api ➞ InteractionContentfulPaint ➞ presentationTime
  10. api ➞ MathMLAnchorElement
  11. api ➞ MathMLAnchorElement ➞ hash
  12. api ➞ MathMLAnchorElement ➞ host
  13. api ➞ MathMLAnchorElement ➞ hostname
  14. api ➞ MathMLAnchorElement ➞ href
  15. api ➞ MathMLAnchorElement ➞ hreflang
  16. api ➞ MathMLAnchorElement ➞ origin
  17. api ➞ MathMLAnchorElement ➞ password
  18. api ➞ MathMLAnchorElement ➞ pathname
  19. api ➞ MathMLAnchorElement ➞ port
  20. api ➞ MathMLAnchorElement ➞ protocol
  21. api ➞ MathMLAnchorElement ➞ search
  22. api ➞ MathMLAnchorElement ➞ target
  23. api ➞ MathMLAnchorElement ➞ type
  24. api ➞ MathMLAnchorElement ➞ username
  25. api ➞ MediaStreamTrack ➞ configurationchange_event
  26. api ➞ PerformanceContainerTiming
  27. api ➞ PerformanceContainerTiming ➞ firstRenderTime
  28. api ➞ PerformanceContainerTiming ➞ identifier
  29. api ➞ PerformanceContainerTiming ➞ intersectionRect
  30. api ➞ PerformanceContainerTiming ➞ lastPaintedElement
  31. api ➞ PerformanceContainerTiming ➞ paintTime
  32. api ➞ PerformanceContainerTiming ➞ presentationTime
  33. api ➞ PerformanceContainerTiming ➞ rootElement
  34. api ➞ PerformanceContainerTiming ➞ size
  35. api ➞ PerformanceSoftNavigation
  36. api ➞ PerformanceSoftNavigation ➞ getLargestInteractionContentfulPaint
  37. api ➞ PerformanceSoftNavigation ➞ interactionId
  38. api ➞ PerformanceSoftNavigation ➞ navigationType
  39. api ➞ PerformanceSoftNavigation ➞ paintTime
  40. api ➞ PerformanceSoftNavigation ➞ presentationTime
  41. api ➞ ReportingObserver ➞ ReportingObserver ➞ options_parameter ➞ types_property ➞ connection-allowlist
  42. api ➞ WebTransport ➞ WebTransport ➞ options_protocols_parameter

CSS

  1. css ➞ types ➞ anchor ➞ is_transitionable
  2. css ➞ types ➞ anchor-size ➞ is_transitionable

HTML

  1. html ➞ elements ➞ template ➞ for
  2. html ➞ global_attributes ➞ containertiming
  3. html ➞ global_attributes ➞ containertimingignore
  4. html ➞ global_attributes ➞ elementtiming

HTTP

  1. http ➞ headers ➞ Connection-Allowlist
  2. http ➞ headers ➞ Connection-Allowlist-Report-Only

JAVASCRIPT

  1. javascript ➞ builtins ➞ Promise ➞ allKeyed
  2. javascript ➞ builtins ➞ Promise ➞ allSettledKeyed

WEBASSEMBLY

  1. webassembly ➞ definitions ➞ import
  2. webassembly ➞ definitions ➞ import ➞ compact_imports
  3. webassembly ➞ instructions ➞ add128
  4. webassembly ➞ instructions ➞ mul_wide_s
  5. webassembly ➞ instructions ➞ mul_wide_u
  6. webassembly ➞ instructions ➞ sub128

Removed entries (0)

No features were removed from bcd in this time period