BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +140, -0

Support increases (140)

API

  1. api ➞ CompressionStream ➞ CompressionStream ➞ brotli
    Added to Firefox  ➞  2 of 3 engines
  2. api ➞ DecompressionStream ➞ DecompressionStream ➞ brotli
    Added to Firefox  ➞  2 of 3 engines
  3. api ➞ Document ➞ activeViewTransition
    Added to Firefox  ➞  3 of 3 engines
  4. api ➞ ServiceWorker ➞ ecmascript_modules
    Added to Firefox  ➞  3 of 3 engines
  5. api ➞ ViewTransition ➞ types
    Added to Firefox  ➞  3 of 3 engines
  6. api ➞ ViewTransitionTypeSet ➞ @@iterator
    Added to Firefox  ➞  3 of 3 engines
  7. api ➞ ViewTransitionTypeSet
    Added to Firefox  ➞  3 of 3 engines
  8. api ➞ ViewTransitionTypeSet ➞ add
    Added to Firefox  ➞  3 of 3 engines
  9. api ➞ ViewTransitionTypeSet ➞ clear
    Added to Firefox  ➞  3 of 3 engines
  10. api ➞ ViewTransitionTypeSet ➞ delete
    Added to Firefox  ➞  3 of 3 engines
  11. api ➞ ViewTransitionTypeSet ➞ entries
    Added to Firefox  ➞  3 of 3 engines
  12. api ➞ ViewTransitionTypeSet ➞ forEach
    Added to Firefox  ➞  3 of 3 engines
  13. api ➞ ViewTransitionTypeSet ➞ has
    Added to Firefox  ➞  3 of 3 engines
  14. api ➞ ViewTransitionTypeSet ➞ keys
    Added to Firefox  ➞  3 of 3 engines
  15. api ➞ ViewTransitionTypeSet ➞ size
    Added to Firefox  ➞  3 of 3 engines
  16. api ➞ ViewTransitionTypeSet ➞ values
    Added to Firefox  ➞  3 of 3 engines
  17. api ➞ Window ➞ navigation
    Added to Firefox  ➞  3 of 3 engines

CSS

  1. css ➞ properties ➞ align-items ➞ anchor-center Spec link
    Added to Firefox  ➞  3 of 3 engines
  2. css ➞ properties ➞ align-self ➞ anchor-center Spec link
    Added to Firefox  ➞  3 of 3 engines
  3. css ➞ properties ➞ justify-items ➞ anchor-center Spec link
    Added to Firefox  ➞  3 of 3 engines
  4. css ➞ properties ➞ justify-self ➞ anchor-center Spec link
    Added to Firefox  ➞  3 of 3 engines
  5. css ➞ properties ➞ position-try ➞ block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  6. css ➞ properties ➞ position-try ➞ block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  7. css ➞ properties ➞ position-try ➞ bottom Spec link
    Added to Firefox  ➞  3 of 3 engines
  8. css ➞ properties ➞ position-try ➞ center Spec link
    Added to Firefox  ➞  3 of 3 engines
  9. css ➞ properties ➞ position-try ➞ end Spec link
    Added to Firefox  ➞  3 of 3 engines
  10. css ➞ properties ➞ position-try ➞ flip-block Spec link
    Added to Firefox  ➞  3 of 3 engines
  11. css ➞ properties ➞ position-try ➞ flip-inline Spec link
    Added to Firefox  ➞  3 of 3 engines
  12. css ➞ properties ➞ position-try ➞ flip-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  13. css ➞ properties ➞ position-try ➞ flip-x Spec link
    Added to Firefox  ➞  2 of 3 engines
  14. css ➞ properties ➞ position-try ➞ flip-y Spec link
    Added to Firefox  ➞  2 of 3 engines
  15. css ➞ properties ➞ position-try ➞ inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  16. css ➞ properties ➞ position-try ➞ inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  17. css ➞ properties ➞ position-try ➞ left Spec link
    Added to Firefox  ➞  3 of 3 engines
  18. css ➞ properties ➞ position-try ➞ none Spec link
    Added to Firefox  ➞  3 of 3 engines
  19. css ➞ properties ➞ position-try ➞ right Spec link
    Added to Firefox  ➞  3 of 3 engines
  20. css ➞ properties ➞ position-try ➞ self-block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  21. css ➞ properties ➞ position-try ➞ self-block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  22. css ➞ properties ➞ position-try ➞ self-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  23. css ➞ properties ➞ position-try ➞ self-inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  24. css ➞ properties ➞ position-try ➞ self-inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  25. css ➞ properties ➞ position-try ➞ self-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  26. css ➞ properties ➞ position-try ➞ span-all Spec link
    Added to Firefox  ➞  3 of 3 engines
  27. css ➞ properties ➞ position-try ➞ span-block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  28. css ➞ properties ➞ position-try ➞ span-block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  29. css ➞ properties ➞ position-try ➞ span-bottom Spec link
    Added to Firefox  ➞  3 of 3 engines
  30. css ➞ properties ➞ position-try ➞ span-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  31. css ➞ properties ➞ position-try ➞ span-inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  32. css ➞ properties ➞ position-try ➞ span-inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  33. css ➞ properties ➞ position-try ➞ span-left Spec link
    Added to Firefox  ➞  3 of 3 engines
  34. css ➞ properties ➞ position-try ➞ span-right Spec link
    Added to Firefox  ➞  3 of 3 engines
  35. css ➞ properties ➞ position-try ➞ span-self-block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  36. css ➞ properties ➞ position-try ➞ span-self-block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  37. css ➞ properties ➞ position-try ➞ span-self-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  38. css ➞ properties ➞ position-try ➞ span-self-inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  39. css ➞ properties ➞ position-try ➞ span-self-inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  40. css ➞ properties ➞ position-try ➞ span-self-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  41. css ➞ properties ➞ position-try ➞ span-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  42. css ➞ properties ➞ position-try ➞ span-top Spec link
    Added to Firefox  ➞  3 of 3 engines
  43. css ➞ properties ➞ position-try ➞ span-x-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  44. css ➞ properties ➞ position-try ➞ span-x-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  45. css ➞ properties ➞ position-try ➞ span-y-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  46. css ➞ properties ➞ position-try ➞ span-y-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  47. css ➞ properties ➞ position-try ➞ start Spec link
    Added to Firefox  ➞  3 of 3 engines
  48. css ➞ properties ➞ position-try ➞ top Spec link
    Added to Firefox  ➞  3 of 3 engines
  49. css ➞ properties ➞ position-try ➞ x-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  50. css ➞ properties ➞ position-try ➞ x-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  51. css ➞ properties ➞ position-try ➞ y-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  52. css ➞ properties ➞ position-try ➞ y-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  53. css ➞ properties ➞ position-try-fallbacks ➞ block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  54. css ➞ properties ➞ position-try-fallbacks ➞ block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  55. css ➞ properties ➞ position-try-fallbacks ➞ bottom Spec link
    Added to Firefox  ➞  3 of 3 engines
  56. css ➞ properties ➞ position-try-fallbacks ➞ center Spec link
    Added to Firefox  ➞  3 of 3 engines
  57. css ➞ properties ➞ position-try-fallbacks ➞ end Spec link
    Added to Firefox  ➞  3 of 3 engines
  58. css ➞ properties ➞ position-try-fallbacks ➞ flip-x Spec link
    Added to Firefox  ➞  2 of 3 engines
  59. css ➞ properties ➞ position-try-fallbacks ➞ flip-y Spec link
    Added to Firefox  ➞  2 of 3 engines
  60. css ➞ properties ➞ position-try-fallbacks ➞ inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  61. css ➞ properties ➞ position-try-fallbacks ➞ inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  62. css ➞ properties ➞ position-try-fallbacks ➞ left Spec link
    Added to Firefox  ➞  3 of 3 engines
  63. css ➞ properties ➞ position-try-fallbacks ➞ right Spec link
    Added to Firefox  ➞  3 of 3 engines
  64. css ➞ properties ➞ position-try-fallbacks ➞ self-block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  65. css ➞ properties ➞ position-try-fallbacks ➞ self-block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  66. css ➞ properties ➞ position-try-fallbacks ➞ self-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  67. css ➞ properties ➞ position-try-fallbacks ➞ self-inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  68. css ➞ properties ➞ position-try-fallbacks ➞ self-inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  69. css ➞ properties ➞ position-try-fallbacks ➞ self-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  70. css ➞ properties ➞ position-try-fallbacks ➞ span-all Spec link
    Added to Firefox  ➞  3 of 3 engines
  71. css ➞ properties ➞ position-try-fallbacks ➞ span-block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  72. css ➞ properties ➞ position-try-fallbacks ➞ span-block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  73. css ➞ properties ➞ position-try-fallbacks ➞ span-bottom Spec link
    Added to Firefox  ➞  3 of 3 engines
  74. css ➞ properties ➞ position-try-fallbacks ➞ span-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  75. css ➞ properties ➞ position-try-fallbacks ➞ span-inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  76. css ➞ properties ➞ position-try-fallbacks ➞ span-inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  77. css ➞ properties ➞ position-try-fallbacks ➞ span-left Spec link
    Added to Firefox  ➞  3 of 3 engines
  78. css ➞ properties ➞ position-try-fallbacks ➞ span-right Spec link
    Added to Firefox  ➞  3 of 3 engines
  79. css ➞ properties ➞ position-try-fallbacks ➞ span-self-block-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  80. css ➞ properties ➞ position-try-fallbacks ➞ span-self-block-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  81. css ➞ properties ➞ position-try-fallbacks ➞ span-self-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  82. css ➞ properties ➞ position-try-fallbacks ➞ span-self-inline-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  83. css ➞ properties ➞ position-try-fallbacks ➞ span-self-inline-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  84. css ➞ properties ➞ position-try-fallbacks ➞ span-self-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  85. css ➞ properties ➞ position-try-fallbacks ➞ span-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  86. css ➞ properties ➞ position-try-fallbacks ➞ span-top Spec link
    Added to Firefox  ➞  3 of 3 engines
  87. css ➞ properties ➞ position-try-fallbacks ➞ span-x-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  88. css ➞ properties ➞ position-try-fallbacks ➞ span-x-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  89. css ➞ properties ➞ position-try-fallbacks ➞ span-y-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  90. css ➞ properties ➞ position-try-fallbacks ➞ span-y-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  91. css ➞ properties ➞ position-try-fallbacks ➞ start Spec link
    Added to Firefox  ➞  3 of 3 engines
  92. css ➞ properties ➞ position-try-fallbacks ➞ top Spec link
    Added to Firefox  ➞  3 of 3 engines
  93. css ➞ properties ➞ position-try-fallbacks ➞ x-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  94. css ➞ properties ➞ position-try-fallbacks ➞ x-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  95. css ➞ properties ➞ position-try-fallbacks ➞ y-end Spec link
    Added to Firefox  ➞  3 of 3 engines
  96. css ➞ properties ➞ position-try-fallbacks ➞ y-start Spec link
    Added to Firefox  ➞  3 of 3 engines
  97. css ➞ properties ➞ position-visibility ➞ anchors-visible Spec link
    Added to Firefox  ➞  3 of 3 engines
  98. css ➞ selectors ➞ active-view-transition-type
    Added to Firefox  ➞  3 of 3 engines
  99. css ➞ types ➞ length ➞ rcap Spec link
    Added to Firefox  ➞  3 of 3 engines
  100. css ➞ types ➞ length ➞ rch Spec link
    Added to Firefox  ➞  3 of 3 engines
  101. css ➞ types ➞ length ➞ rex Spec link
    Added to Firefox  ➞  3 of 3 engines
  102. css ➞ types ➞ length ➞ ric Spec link
    Added to Firefox  ➞  3 of 3 engines
  103. css ➞ properties ➞ position-anchor ➞ none
    Added to Firefox,Chrome  ➞  2 of 3 engines
  104. css ➞ properties ➞ position-try ➞ self-x-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  105. css ➞ properties ➞ position-try ➞ self-x-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  106. css ➞ properties ➞ position-try ➞ self-y-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  107. css ➞ properties ➞ position-try ➞ self-y-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  108. css ➞ properties ➞ position-try ➞ span-self-x-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  109. css ➞ properties ➞ position-try ➞ span-self-x-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  110. css ➞ properties ➞ position-try ➞ span-self-y-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  111. css ➞ properties ➞ position-try ➞ span-self-y-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  112. css ➞ properties ➞ position-try-fallbacks ➞ self-x-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  113. css ➞ properties ➞ position-try-fallbacks ➞ self-x-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  114. css ➞ properties ➞ position-try-fallbacks ➞ self-y-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  115. css ➞ properties ➞ position-try-fallbacks ➞ self-y-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  116. css ➞ properties ➞ position-try-fallbacks ➞ span-self-x-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  117. css ➞ properties ➞ position-try-fallbacks ➞ span-self-x-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  118. css ➞ properties ➞ position-try-fallbacks ➞ span-self-y-end Spec link
    Added to Firefox  ➞  1 of 3 engines
  119. css ➞ properties ➞ position-try-fallbacks ➞ span-self-y-start Spec link
    Added to Firefox  ➞  1 of 3 engines
  120. css ➞ properties ➞ position-visibility ➞ anchors-valid Spec link
    Added to Firefox  ➞  1 of 3 engines

JAVASCRIPT

  1. javascript ➞ regular_expressions ➞ modifier
    Added to Safari  ➞  3 of 3 engines
  2. javascript ➞ statements ➞ import ➞ service_worker_support
    Added to Firefox  ➞  3 of 3 engines

WEBDRIVER

  1. webdriver ➞ bidi ➞ emulation ➞ setScreenSettingsOverride Spec link
    Added to Firefox  ➞  1 of 3 engines

BCD Metadata Changes: 152

Show all 152 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 (63)

The entries in this section saw support information change since the report on Friday, 5 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 ➞ CompressionStream ➞ CompressionStream ➞ zstd
    Backfilled for Firefox  ➞  1 of 3 engines
  2. api ➞ DecompressionStream ➞ DecompressionStream ➞ zstd
    Backfilled for Firefox  ➞  1 of 3 engines
  3. api ➞ TrustedHTML
    Backfilled for Firefox  ➞  3 of 3 engines
  4. api ➞ TrustedHTML ➞ toJSON
    Backfilled for Firefox  ➞  3 of 3 engines
  5. api ➞ TrustedHTML ➞ toString
    Backfilled for Firefox  ➞  3 of 3 engines
  6. api ➞ TrustedScript
    Backfilled for Firefox  ➞  3 of 3 engines
  7. api ➞ TrustedScript ➞ toJSON
    Backfilled for Firefox  ➞  3 of 3 engines
  8. api ➞ TrustedScript ➞ toString
    Backfilled for Firefox  ➞  3 of 3 engines
  9. api ➞ TrustedScriptURL
    Backfilled for Firefox  ➞  3 of 3 engines
  10. api ➞ TrustedScriptURL ➞ toJSON
    Backfilled for Firefox  ➞  3 of 3 engines
  11. api ➞ TrustedScriptURL ➞ toString
    Backfilled for Firefox  ➞  3 of 3 engines
  12. api ➞ TrustedTypePolicy
    Backfilled for Firefox  ➞  3 of 3 engines
  13. api ➞ TrustedTypePolicy ➞ createHTML
    Backfilled for Firefox  ➞  3 of 3 engines
  14. api ➞ TrustedTypePolicy ➞ createScript
    Backfilled for Firefox  ➞  3 of 3 engines
  15. api ➞ TrustedTypePolicy ➞ createScriptURL
    Backfilled for Firefox  ➞  3 of 3 engines
  16. api ➞ TrustedTypePolicy ➞ name
    Backfilled for Firefox  ➞  3 of 3 engines
  17. api ➞ TrustedTypePolicyFactory ➞ createPolicy
    Backfilled for Firefox  ➞  3 of 3 engines
  18. api ➞ TrustedTypePolicyFactory ➞ defaultPolicy
    Backfilled for Firefox  ➞  3 of 3 engines
  19. api ➞ TrustedTypePolicyFactory ➞ emptyHTML
    Backfilled for Firefox  ➞  3 of 3 engines
  20. api ➞ TrustedTypePolicyFactory ➞ emptyScript
    Backfilled for Firefox  ➞  3 of 3 engines
  21. api ➞ TrustedTypePolicyFactory ➞ isHTML
    Backfilled for Firefox  ➞  3 of 3 engines
  22. api ➞ TrustedTypePolicyFactory ➞ isScript
    Backfilled for Firefox  ➞  3 of 3 engines
  23. api ➞ TrustedTypePolicyFactory ➞ isScriptURL
    Backfilled for Firefox  ➞  3 of 3 engines
  24. api ➞ GPUSupportedFeatures ➞ feature_texture-component-swizzle Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  25. api ➞ GPUTexture ➞ createView ➞ descriptor_swizzle_parameter Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  26. api ➞ SubtleCrypto ➞ importKey ➞ ECDH
    Backfilled for Firefox  ➞  3 of 3 engines
  27. api ➞ SubtleCrypto ➞ importKey ➞ ECDH ➞ compressed_elliptic_curve_points Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  28. api ➞ SubtleCrypto ➞ importKey ➞ ECDSA
    Backfilled for Firefox  ➞  3 of 3 engines
  29. api ➞ SubtleCrypto ➞ importKey ➞ ECDSA ➞ compressed_elliptic_curve_points Spec link
    Backfilled for Firefox  ➞  2 of 3 engines

CSS

  1. css ➞ at-rules ➞ container ➞ anchor_position_queries Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  2. css ➞ at-rules ➞ container ➞ anchor_position_queries ➞ fallback Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  3. css ➞ at-rules ➞ container ➞ anchor_position_queries ➞ fallback ➞ any_value Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  4. css ➞ properties ➞ container-type ➞ anchored Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  5. css ➞ selectors ➞ view-transition-group-children Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  6. css ➞ types ➞ attr ➞ declaration-value Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  7. css ➞ types ➞ attr ➞ type_function
    Backfilled for Chrome  ➞  1 of 3 engines
  8. css ➞ types ➞ attr ➞ type_function ➞ angle
    Backfilled for Chrome  ➞  1 of 3 engines
  9. css ➞ types ➞ attr ➞ type_function ➞ color
    Backfilled for Chrome  ➞  1 of 3 engines
  10. css ➞ types ➞ attr ➞ type_function ➞ custom-ident
    Backfilled for Chrome  ➞  1 of 3 engines
  11. css ➞ types ➞ attr ➞ type_function ➞ integer
    Backfilled for Chrome  ➞  1 of 3 engines
  12. css ➞ types ➞ attr ➞ type_function ➞ length
    Backfilled for Chrome  ➞  1 of 3 engines
  13. css ➞ types ➞ attr ➞ type_function ➞ number
    Backfilled for Chrome  ➞  1 of 3 engines
  14. css ➞ types ➞ attr ➞ type_function ➞ percentage
    Backfilled for Chrome  ➞  1 of 3 engines
  15. css ➞ types ➞ attr ➞ type_function ➞ string
    Backfilled for Chrome  ➞  1 of 3 engines
  16. css ➞ types ➞ attr ➞ type_function ➞ time
    Backfilled for Chrome  ➞  1 of 3 engines
  17. css ➞ types ➞ attr ➞ type_function ➞ url
    Backfilled for Chrome  ➞  1 of 3 engines

MEDIATYPES

  1. mediatypes ➞ image ➞ avif
    Backfilled for Firefox  ➞  2 of 3 engines
  2. mediatypes ➞ image ➞ avif ➞ animation Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. mediatypes ➞ image ➞ bmp
    Backfilled for Firefox  ➞  3 of 3 engines
  4. mediatypes ➞ image ➞ gif
    Backfilled for Firefox  ➞  3 of 3 engines
  5. mediatypes ➞ image ➞ heif Spec link
    Backfilled for Safari  ➞  1 of 3 engines
  6. mediatypes ➞ image ➞ ico
    Backfilled for Firefox  ➞  3 of 3 engines
  7. mediatypes ➞ image ➞ jpeg
    Backfilled for Firefox  ➞  3 of 3 engines
  8. mediatypes ➞ image ➞ jxl
    Backfilled for Firefox  ➞  2 of 3 engines
  9. mediatypes ➞ image ➞ png
    Backfilled for Firefox  ➞  3 of 3 engines
  10. mediatypes ➞ image ➞ png ➞ animation Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  11. mediatypes ➞ image ➞ svg
    Backfilled for Firefox  ➞  3 of 3 engines
  12. mediatypes ➞ image ➞ tiff
    Backfilled for Safari  ➞  1 of 3 engines
  13. mediatypes ➞ image ➞ webp
    Backfilled for Firefox  ➞  3 of 3 engines
  14. mediatypes ➞ image ➞ webp ➞ alpha
    Backfilled for Firefox  ➞  3 of 3 engines
  15. mediatypes ➞ image ➞ webp ➞ animation
    Backfilled for Firefox  ➞  3 of 3 engines
  16. mediatypes ➞ image ➞ webp ➞ lossless
    Backfilled for Firefox  ➞  3 of 3 engines
  17. mediatypes ➞ image ➞ webp ➞ lossy
    Backfilled for Firefox  ➞  3 of 3 engines

New entries (64)

The entries in this section were not found in BCD on Friday, 5 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 ➞ GPUSupportedFeatures ➞ feature_texture-component-swizzle
  2. api ➞ GPUTexture ➞ createView ➞ descriptor_swizzle_parameter
  3. api ➞ SubtleCrypto ➞ importKey ➞ ECDH
  4. api ➞ SubtleCrypto ➞ importKey ➞ ECDH ➞ compressed_elliptic_curve_points
  5. api ➞ SubtleCrypto ➞ importKey ➞ ECDSA
  6. api ➞ SubtleCrypto ➞ importKey ➞ ECDSA ➞ compressed_elliptic_curve_points

CSS

  1. css ➞ at-rules ➞ container ➞ anchor_position_queries
  2. css ➞ at-rules ➞ container ➞ anchor_position_queries ➞ fallback
  3. css ➞ at-rules ➞ container ➞ anchor_position_queries ➞ fallback ➞ any_value
  4. css ➞ properties ➞ container-type ➞ anchored
  5. css ➞ properties ➞ position-anchor ➞ none
  6. css ➞ properties ➞ position-try ➞ self-x-end
  7. css ➞ properties ➞ position-try ➞ self-x-start
  8. css ➞ properties ➞ position-try ➞ self-y-end
  9. css ➞ properties ➞ position-try ➞ self-y-start
  10. css ➞ properties ➞ position-try ➞ span-self-x-end
  11. css ➞ properties ➞ position-try ➞ span-self-x-start
  12. css ➞ properties ➞ position-try ➞ span-self-y-end
  13. css ➞ properties ➞ position-try ➞ span-self-y-start
  14. css ➞ properties ➞ position-try-fallbacks ➞ self-x-end
  15. css ➞ properties ➞ position-try-fallbacks ➞ self-x-start
  16. css ➞ properties ➞ position-try-fallbacks ➞ self-y-end
  17. css ➞ properties ➞ position-try-fallbacks ➞ self-y-start
  18. css ➞ properties ➞ position-try-fallbacks ➞ span-self-x-end
  19. css ➞ properties ➞ position-try-fallbacks ➞ span-self-x-start
  20. css ➞ properties ➞ position-try-fallbacks ➞ span-self-y-end
  21. css ➞ properties ➞ position-try-fallbacks ➞ span-self-y-start
  22. css ➞ properties ➞ position-visibility ➞ anchors-valid
  23. css ➞ selectors ➞ view-transition-group-children
  24. css ➞ types ➞ attr ➞ declaration-value
  25. css ➞ types ➞ attr ➞ type_function
  26. css ➞ types ➞ attr ➞ type_function ➞ angle
  27. css ➞ types ➞ attr ➞ type_function ➞ color
  28. css ➞ types ➞ attr ➞ type_function ➞ custom-ident
  29. css ➞ types ➞ attr ➞ type_function ➞ ident
  30. css ➞ types ➞ attr ➞ type_function ➞ image
  31. css ➞ types ➞ attr ➞ type_function ➞ integer
  32. css ➞ types ➞ attr ➞ type_function ➞ length
  33. css ➞ types ➞ attr ➞ type_function ➞ length-percentage
  34. css ➞ types ➞ attr ➞ type_function ➞ number
  35. css ➞ types ➞ attr ➞ type_function ➞ percentage
  36. css ➞ types ➞ attr ➞ type_function ➞ resolution
  37. css ➞ types ➞ attr ➞ type_function ➞ string
  38. css ➞ types ➞ attr ➞ type_function ➞ time
  39. css ➞ types ➞ attr ➞ type_function ➞ transform-function
  40. css ➞ types ➞ attr ➞ type_function ➞ url

MEDIATYPES

  1. mediatypes ➞ image ➞ avif
  2. mediatypes ➞ image ➞ avif ➞ animation
  3. mediatypes ➞ image ➞ bmp
  4. mediatypes ➞ image ➞ gif
  5. mediatypes ➞ image ➞ heif
  6. mediatypes ➞ image ➞ ico
  7. mediatypes ➞ image ➞ jpeg
  8. mediatypes ➞ image ➞ jxl
  9. mediatypes ➞ image ➞ png
  10. mediatypes ➞ image ➞ png ➞ animation
  11. mediatypes ➞ image ➞ svg
  12. mediatypes ➞ image ➞ tiff
  13. mediatypes ➞ image ➞ webp
  14. mediatypes ➞ image ➞ webp ➞ alpha
  15. mediatypes ➞ image ➞ webp ➞ animation
  16. mediatypes ➞ image ➞ webp ➞ lossless
  17. mediatypes ➞ image ➞ webp ➞ lossy

WEBDRIVER

  1. webdriver ➞ bidi ➞ emulation ➞ setScreenSettingsOverride

Removed entries (25)

The entries in this section were found in BCD on Friday, 5 December 2025, 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 ➞ position-try ➞ span-x-self-end
  2. css ➞ properties ➞ position-try ➞ span-x-self-start
  3. css ➞ properties ➞ position-try ➞ span-y-self-end
  4. css ➞ properties ➞ position-try ➞ span-y-self-start
  5. css ➞ properties ➞ position-try ➞ x-self-end
  6. css ➞ properties ➞ position-try ➞ x-self-start
  7. css ➞ properties ➞ position-try ➞ y-self-end
  8. css ➞ properties ➞ position-try ➞ y-self-start
  9. css ➞ properties ➞ position-try-fallbacks ➞ span-x-self-end
  10. css ➞ properties ➞ position-try-fallbacks ➞ span-x-self-start
  11. css ➞ properties ➞ position-try-fallbacks ➞ span-y-self-end
  12. css ➞ properties ➞ position-try-fallbacks ➞ span-y-self-start
  13. css ➞ properties ➞ position-try-fallbacks ➞ x-self-end
  14. css ➞ properties ➞ position-try-fallbacks ➞ x-self-start
  15. css ➞ properties ➞ position-try-fallbacks ➞ y-self-end
  16. css ➞ properties ➞ position-try-fallbacks ➞ y-self-start
  17. css ➞ types ➞ attr ➞ fallback
  18. css ➞ types ➞ attr ➞ type-or-unit
  19. css ➞ types ➞ attr ➞ type-or-unit ➞ angle
  20. css ➞ types ➞ attr ➞ type-or-unit ➞ color
  21. css ➞ types ➞ attr ➞ type-or-unit ➞ integer
  22. css ➞ types ➞ attr ➞ type-or-unit ➞ length
  23. css ➞ types ➞ attr ➞ type-or-unit ➞ number
  24. css ➞ types ➞ attr ➞ type-or-unit ➞ percentage
  25. css ➞ types ➞ attr ➞ type-or-unit ➞ time