BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +59, -0

Support increases (59)

API

  1. api ➞ Element ➞ setHTML
    Added to Chrome  ➞  2 of 3 engines
  2. api ➞ HTMLElement ➞ focus ➞ options_focusVisible_parameter
    Added to Chrome  ➞  3 of 3 engines
  3. api ➞ Location ➞ ancestorOrigins
    Added to Firefox  ➞  3 of 3 engines
  4. api ➞ NavigationHistoryEntry ➞ dispose_event
    Added to Safari  ➞  3 of 3 engines
  5. api ➞ PerformancePaintTiming ➞ paintTime Spec link
    Added to Chrome  ➞  2 of 3 engines
  6. api ➞ PerformancePaintTiming ➞ presentationTime Spec link
    Added to Chrome  ➞  2 of 3 engines
  7. api ➞ Sanitizer ➞ Sanitizer Spec link
    Added to Chrome  ➞  2 of 3 engines
  8. api ➞ Sanitizer Spec link
    Added to Chrome  ➞  2 of 3 engines
  9. api ➞ Sanitizer ➞ allowAttribute
    Added to Chrome  ➞  2 of 3 engines
  10. api ➞ Sanitizer ➞ allowElement
    Added to Chrome  ➞  2 of 3 engines
  11. api ➞ Sanitizer ➞ get
    Added to Chrome  ➞  2 of 3 engines
  12. api ➞ Sanitizer ➞ removeAttribute
    Added to Chrome  ➞  2 of 3 engines
  13. api ➞ Sanitizer ➞ removeElement
    Added to Chrome  ➞  2 of 3 engines
  14. api ➞ Sanitizer ➞ removeUnsafe
    Added to Chrome  ➞  2 of 3 engines
  15. api ➞ Sanitizer ➞ replaceElementWithChildren
    Added to Chrome  ➞  2 of 3 engines
  16. api ➞ Sanitizer ➞ setComments
    Added to Chrome  ➞  2 of 3 engines
  17. api ➞ Sanitizer ➞ setDataAttributes
    Added to Chrome  ➞  2 of 3 engines
  18. api ➞ NavigationPrecommitController ➞ addHandler Spec link
    Added to Firefox  ➞  1 of 3 engines
  19. api ➞ NavigationTransition ➞ to Spec link
    Added to Chrome  ➞  1 of 3 engines
  20. api ➞ Origin ➞ Origin Spec link
    Added to Chrome  ➞  1 of 3 engines
  21. api ➞ Origin Spec link
    Added to Chrome  ➞  1 of 3 engines
  22. api ➞ Origin ➞ from_static Spec link
    Added to Chrome  ➞  1 of 3 engines
  23. api ➞ Origin ➞ isSameOrigin Spec link
    Added to Chrome  ➞  1 of 3 engines
  24. api ➞ Origin ➞ isSameSite Spec link
    Added to Chrome  ➞  1 of 3 engines
  25. api ➞ Origin ➞ opaque Spec link
    Added to Chrome  ➞  1 of 3 engines
  26. api ➞ PerformanceElementTiming ➞ paintTime Spec link
    Added to Chrome  ➞  1 of 3 engines
  27. api ➞ PerformanceElementTiming ➞ presentationTime Spec link
    Added to Chrome  ➞  1 of 3 engines
  28. api ➞ PerformanceLongAnimationFrameTiming ➞ paintTime Spec link
    Added to Chrome  ➞  1 of 3 engines
  29. api ➞ PerformanceLongAnimationFrameTiming ➞ presentationTime Spec link
    Added to Chrome  ➞  1 of 3 engines
  30. api ➞ PerformanceNavigationTiming ➞ confidence Spec link
    Added to Chrome  ➞  1 of 3 engines
  31. api ➞ PerformanceTimingConfidence Spec link
    Added to Chrome  ➞  1 of 3 engines
  32. api ➞ PerformanceTimingConfidence ➞ randomizedTriggerRate Spec link
    Added to Chrome  ➞  1 of 3 engines
  33. api ➞ PerformanceTimingConfidence ➞ toJSON Spec link
    Added to Chrome  ➞  1 of 3 engines
  34. api ➞ PerformanceTimingConfidence ➞ value Spec link
    Added to Chrome  ➞  1 of 3 engines
  35. api ➞ VideoFrame ➞ metadata Spec link
    Added to Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ properties ➞ overflow-clip-margin ➞ border-box Spec link
    Added to Firefox  ➞  2 of 3 engines
  2. css ➞ properties ➞ overflow-clip-margin ➞ content-box Spec link
    Added to Firefox  ➞  2 of 3 engines
  3. css ➞ properties ➞ overflow-clip-margin ➞ padding-box Spec link
    Added to Firefox  ➞  2 of 3 engines
  4. css ➞ properties ➞ position-try-order
    Added to Firefox  ➞  3 of 3 engines
  5. css ➞ properties ➞ position-try-order ➞ most-block-size Spec link
    Added to Firefox  ➞  3 of 3 engines
  6. css ➞ properties ➞ position-try-order ➞ most-height Spec link
    Added to Firefox  ➞  3 of 3 engines
  7. css ➞ properties ➞ position-try-order ➞ most-inline-size Spec link
    Added to Firefox  ➞  3 of 3 engines
  8. css ➞ properties ➞ position-try-order ➞ most-width Spec link
    Added to Firefox  ➞  3 of 3 engines
  9. css ➞ properties ➞ position-try-order ➞ normal Spec link
    Added to Firefox  ➞  3 of 3 engines
  10. css ➞ properties ➞ text-justify ➞ auto Spec link
    Added to Chrome  ➞  2 of 3 engines
  11. css ➞ properties ➞ text-justify ➞ inter-character Spec link
    Added to Chrome  ➞  1 of 3 engines
  12. css ➞ properties ➞ text-justify ➞ inter-word Spec link
    Added to Chrome  ➞  2 of 3 engines
  13. css ➞ properties ➞ text-justify ➞ none Spec link
    Added to Chrome  ➞  2 of 3 engines
  14. css ➞ properties ➞ word-spacing ➞ percentages (⚠️ deprecated)
    Added to Chrome  ➞  3 of 3 engines
  15. css ➞ properties ➞ column-height Spec link
    Added to Chrome  ➞  1 of 3 engines
  16. css ➞ properties ➞ column-height ➞ auto Spec link
    Added to Chrome  ➞  1 of 3 engines
  17. css ➞ properties ➞ column-wrap Spec link
    Added to Chrome  ➞  1 of 3 engines
  18. css ➞ properties ➞ column-wrap ➞ auto Spec link
    Added to Chrome  ➞  1 of 3 engines
  19. css ➞ properties ➞ column-wrap ➞ nowrap Spec link
    Added to Chrome  ➞  1 of 3 engines
  20. css ➞ properties ➞ column-wrap ➞ wrap Spec link
    Added to Chrome  ➞  1 of 3 engines

JAVASCRIPT

  1. javascript ➞ builtins ➞ Map ➞ getOrInsert
    Added to Chrome  ➞  3 of 3 engines
  2. javascript ➞ builtins ➞ Map ➞ getOrInsertComputed
    Added to Chrome  ➞  3 of 3 engines
  3. javascript ➞ builtins ➞ WeakMap ➞ getOrInsert
    Added to Chrome  ➞  3 of 3 engines
  4. javascript ➞ builtins ➞ WeakMap ➞ getOrInsertComputed
    Added to Chrome  ➞  3 of 3 engines

BCD Metadata Changes: 74

Show all 74 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 (28)

The entries in this section saw support information change since the report on Tuesday, 6 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 ➞ DedicatedWorkerGlobalScope ➞ rtctransform_event
    Backfilled for Chrome  ➞  3 of 3 engines
  2. api ➞ Document ➞ startViewTransition ➞ options_parameter Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. api ➞ Document ➞ startViewTransition ➞ options_parameter ➞ types_parameter Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  4. api ➞ Document ➞ startViewTransition ➞ options_parameter ➞ update_parameter Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  5. api ➞ PerformanceResourceTiming ➞ workerCacheLookupStart Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  6. api ➞ PerformanceResourceTiming ➞ workerRouterEvaluationStart Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ at-rules ➞ font-face ➞ src ➞ format_keyword
    Backfilled for Firefox  ➞  3 of 3 engines
  2. css ➞ properties ➞ position-try ➞ flip-x Spec link
    Backfilled for Chrome  ➞  3 of 3 engines
  3. css ➞ properties ➞ position-try ➞ flip-y Spec link
    Backfilled for Chrome  ➞  3 of 3 engines
  4. css ➞ properties ➞ position-try-fallbacks ➞ flip-x Spec link
    Backfilled for Chrome  ➞  3 of 3 engines
  5. css ➞ properties ➞ position-try-fallbacks ➞ flip-y Spec link
    Backfilled for Chrome  ➞  3 of 3 engines
  6. css ➞ properties ➞ buffered-rendering
    Backfilled for Chrome  ➞  2 of 3 engines
  7. css ➞ properties ➞ buffered-rendering ➞ auto
    Backfilled for Chrome  ➞  2 of 3 engines
  8. css ➞ properties ➞ buffered-rendering ➞ dynamic
    Backfilled for Chrome  ➞  2 of 3 engines
  9. css ➞ properties ➞ buffered-rendering ➞ static
    Backfilled for Chrome  ➞  2 of 3 engines
  10. css ➞ properties ➞ color-rendering
    Backfilled for Chrome  ➞  2 of 3 engines
  11. css ➞ properties ➞ color-rendering ➞ auto
    Backfilled for Chrome  ➞  2 of 3 engines
  12. css ➞ properties ➞ color-rendering ➞ optimizeQuality
    Backfilled for Chrome  ➞  2 of 3 engines
  13. css ➞ properties ➞ color-rendering ➞ optimizeSpeed
    Backfilled for Chrome  ➞  2 of 3 engines
  14. css ➞ selectors ➞ marker ➞ counter_support Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  15. css ➞ selectors ➞ marker ➞ quotes_support
    Backfilled for Firefox  ➞  1 of 3 engines

HTML

  1. html ➞ elements ➞ col ➞ span Spec link
    Backfilled for Chrome  ➞  3 of 3 engines

WEBASSEMBLY

  1. webassembly ➞ api ➞ Memory ➞ toFixedLengthBuffer Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  2. webassembly ➞ api ➞ Memory ➞ toResizableBuffer Spec link
    Backfilled for Chrome  ➞  2 of 3 engines

HTTP

  1. http ➞ headers ➞ No-Vary-Search ➞ http_cache Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  2. http ➞ headers ➞ No-Vary-Search ➞ speculation_rules_prefetch
    Backfilled for Chrome  ➞  1 of 3 engines
  3. http ➞ headers ➞ No-Vary-Search ➞ speculation_rules_prerender
    Backfilled for Chrome  ➞  1 of 3 engines

JAVASCRIPT

  1. javascript ➞ builtins ➞ Iterator ➞ concat
    Backfilled for Firefox  ➞  1 of 3 engines

New entries (44)

The entries in this section were not found in BCD on Tuesday, 6 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.

API

  1. api ➞ Document ➞ startViewTransition ➞ options_parameter
  2. api ➞ Document ➞ startViewTransition ➞ options_parameter ➞ types_parameter
  3. api ➞ Document ➞ startViewTransition ➞ options_parameter ➞ update_parameter
  4. api ➞ NavigationPrecommitController ➞ addHandler
  5. api ➞ NavigationTransition ➞ to
  6. api ➞ Origin ➞ Origin
  7. api ➞ Origin
  8. api ➞ Origin ➞ from_static
  9. api ➞ Origin ➞ isSameOrigin
  10. api ➞ Origin ➞ isSameSite
  11. api ➞ Origin ➞ opaque
  12. api ➞ PerformanceElementTiming ➞ paintTime
  13. api ➞ PerformanceElementTiming ➞ presentationTime
  14. api ➞ PerformanceLongAnimationFrameTiming ➞ paintTime
  15. api ➞ PerformanceLongAnimationFrameTiming ➞ presentationTime
  16. api ➞ PerformanceNavigationTiming ➞ confidence
  17. api ➞ PerformanceResourceTiming ➞ workerCacheLookupStart
  18. api ➞ PerformanceResourceTiming ➞ workerRouterEvaluationStart
  19. api ➞ PerformanceTimingConfidence
  20. api ➞ PerformanceTimingConfidence ➞ randomizedTriggerRate
  21. api ➞ PerformanceTimingConfidence ➞ toJSON
  22. api ➞ PerformanceTimingConfidence ➞ value
  23. api ➞ VideoFrame ➞ metadata

CSS

  1. css ➞ properties ➞ buffered-rendering
  2. css ➞ properties ➞ buffered-rendering ➞ auto
  3. css ➞ properties ➞ buffered-rendering ➞ dynamic
  4. css ➞ properties ➞ buffered-rendering ➞ static
  5. css ➞ properties ➞ color-rendering
  6. css ➞ properties ➞ color-rendering ➞ auto
  7. css ➞ properties ➞ color-rendering ➞ optimizeQuality
  8. css ➞ properties ➞ color-rendering ➞ optimizeSpeed
  9. css ➞ properties ➞ column-height
  10. css ➞ properties ➞ column-height ➞ auto
  11. css ➞ properties ➞ column-wrap
  12. css ➞ properties ➞ column-wrap ➞ auto
  13. css ➞ properties ➞ column-wrap ➞ nowrap
  14. css ➞ properties ➞ column-wrap ➞ wrap
  15. css ➞ properties ➞ content ➞ alt_text ➞ counters
  16. css ➞ selectors ➞ marker ➞ counter_support
  17. css ➞ selectors ➞ marker ➞ quotes_support

HTTP

  1. http ➞ headers ➞ No-Vary-Search ➞ http_cache
  2. http ➞ headers ➞ No-Vary-Search ➞ speculation_rules_prefetch
  3. http ➞ headers ➞ No-Vary-Search ➞ speculation_rules_prerender

JAVASCRIPT

  1. javascript ➞ builtins ➞ Iterator ➞ concat

Removed entries (2)

The entries in this section were found in BCD on Tuesday, 6 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.

API

  1. api ➞ Document ➞ startViewTransition ➞ callbackOptions_parameter
  2. api ➞ Window ➞ sizeToContent