BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +8, -0

Support increases (8)

API

  1. api ➞ HTMLImageElement ➞ sizes ➞ auto Spec link
    Added to Safari  ➞  3 of 3 engines

WEBDRIVER

  1. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast Spec link
    Added to Firefox  ➞  1 of 3 engines
  2. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast ➞ context_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  3. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast ➞ mimeType_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  4. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast ➞ video_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  5. webdriver ➞ bidi ➞ browsingContext ➞ stopScreencast Spec link
    Added to Firefox  ➞  1 of 3 engines
  6. webdriver ➞ bidi ➞ browsingContext ➞ stopScreencast ➞ screencast_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  7. webdriver ➞ bidi ➞ emulation ➞ setTimezoneOverride ➞ dedicated_and_shared_workers
    Added to Firefox  ➞  1 of 3 engines

BCD Metadata Changes: 61

Show all 61 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 (44)

The entries in this section saw support information change since the report on Friday, 19 June 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 ➞ AnimationTimeline ➞ duration
    Backfilled for Firefox  ➞  3 of 3 engines
  2. api ➞ Element ➞ animate ➞ options_timeline_parameter Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. api ➞ HTMLInputElement ➞ alpha
    Backfilled for Firefox  ➞  2 of 3 engines
  4. api ➞ ScrollTimeline ➞ ScrollTimeline
    Backfilled for Firefox  ➞  3 of 3 engines
  5. api ➞ ScrollTimeline
    Backfilled for Firefox  ➞  3 of 3 engines
  6. api ➞ ScrollTimeline ➞ axis
    Backfilled for Firefox  ➞  3 of 3 engines
  7. api ➞ ScrollTimeline ➞ source
    Backfilled for Firefox  ➞  3 of 3 engines
  8. api ➞ ViewTimeline ➞ ViewTimeline
    Backfilled for Firefox  ➞  3 of 3 engines
  9. api ➞ ViewTimeline
    Backfilled for Firefox  ➞  3 of 3 engines
  10. api ➞ ViewTimeline ➞ endOffset
    Backfilled for Firefox  ➞  3 of 3 engines
  11. api ➞ ViewTimeline ➞ startOffset
    Backfilled for Firefox  ➞  3 of 3 engines
  12. api ➞ ViewTimeline ➞ subject
    Backfilled for Firefox  ➞  3 of 3 engines
  13. api ➞ Window ➞ requestResize Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ properties ➞ animation-duration ➞ auto Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  2. css ➞ properties ➞ animation-timeline ➞ auto Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. css ➞ properties ➞ animation-timeline ➞ none Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  4. css ➞ properties ➞ scroll-timeline ➞ none Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  5. css ➞ properties ➞ scroll-timeline-axis ➞ block Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  6. css ➞ properties ➞ scroll-timeline-axis ➞ inline Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  7. css ➞ properties ➞ scroll-timeline-axis ➞ x Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  8. css ➞ properties ➞ scroll-timeline-axis ➞ y Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  9. css ➞ properties ➞ scroll-timeline-name ➞ none Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  10. css ➞ properties ➞ timeline-scope
    Backfilled for Firefox  ➞  3 of 3 engines
  11. css ➞ properties ➞ timeline-scope ➞ all Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  12. css ➞ properties ➞ timeline-scope ➞ none Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  13. css ➞ properties ➞ view-timeline ➞ none Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  14. css ➞ properties ➞ view-timeline-axis ➞ block Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  15. css ➞ properties ➞ view-timeline-axis ➞ inline Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  16. css ➞ properties ➞ view-timeline-axis ➞ x Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  17. css ➞ properties ➞ view-timeline-axis ➞ y Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  18. css ➞ properties ➞ view-timeline-inset
    Backfilled for Firefox  ➞  3 of 3 engines
  19. css ➞ properties ➞ view-timeline-inset ➞ auto Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  20. css ➞ properties ➞ view-timeline-name ➞ none Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  21. css ➞ types ➞ sibling-count
    Backfilled for Firefox  ➞  3 of 3 engines
  22. css ➞ types ➞ sibling-index
    Backfilled for Firefox  ➞  3 of 3 engines
  23. css ➞ properties ➞ frame-sizing Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  24. css ➞ properties ➞ frame-sizing ➞ auto Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  25. css ➞ properties ➞ frame-sizing ➞ content-block-size Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  26. css ➞ properties ➞ frame-sizing ➞ content-height Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  27. css ➞ properties ➞ frame-sizing ➞ content-inline-size Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  28. css ➞ properties ➞ frame-sizing ➞ content-width Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  29. css ➞ properties ➞ link-parameters Spec link
    Backfilled for Firefox  ➞  1 of 3 engines
  30. css ➞ properties ➞ link-parameters ➞ none Spec link
    Backfilled for Firefox  ➞  1 of 3 engines

HTML

  1. html ➞ elements ➞ meta ➞ name ➞ responsive-embedded-sizing Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

New entries (17)

The entries in this section were not found in BCD on Friday, 19 June 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 ➞ Window ➞ requestResize

CSS

  1. css ➞ properties ➞ frame-sizing
  2. css ➞ properties ➞ frame-sizing ➞ auto
  3. css ➞ properties ➞ frame-sizing ➞ content-block-size
  4. css ➞ properties ➞ frame-sizing ➞ content-height
  5. css ➞ properties ➞ frame-sizing ➞ content-inline-size
  6. css ➞ properties ➞ frame-sizing ➞ content-width
  7. css ➞ properties ➞ link-parameters
  8. css ➞ properties ➞ link-parameters ➞ none

HTML

  1. html ➞ elements ➞ meta ➞ name ➞ responsive-embedded-sizing

WEBDRIVER

  1. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast
  2. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast ➞ context_parameter
  3. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast ➞ mimeType_parameter
  4. webdriver ➞ bidi ➞ browsingContext ➞ startScreencast ➞ video_parameter
  5. webdriver ➞ bidi ➞ browsingContext ➞ stopScreencast
  6. webdriver ➞ bidi ➞ browsingContext ➞ stopScreencast ➞ screencast_parameter
  7. webdriver ➞ bidi ➞ emulation ➞ setTimezoneOverride ➞ dedicated_and_shared_workers

Removed entries (0)

No features were removed from bcd in this time period