BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +17, -0

Support increases (17)

API

  1. api ➞ Element ➞ requestPointerLock ➞ options_unadjustedMovement_parameter
    Added to Firefox  ➞  3 of 3 engines
  2. api ➞ MathMLElement ➞ nonce Spec link
    Added to Firefox  ➞  3 of 3 engines
  3. api ➞ PerformanceResourceTiming ➞ finalResponseHeadersStart
    Added to Firefox  ➞  3 of 3 engines
  4. api ➞ PerformanceResourceTiming ➞ firstInterimResponseStart
    Added to Firefox  ➞  3 of 3 engines
  5. api ➞ RTCEncodedAudioFrame ➞ RTCEncodedAudioFrame ➞ options_metadata_receiveTime_parameter Spec link
    Added to Firefox  ➞  2 of 3 engines
  6. api ➞ RTCEncodedAudioFrame ➞ getMetadata ➞ return_object_property_receiveTime Spec link
    Added to Firefox  ➞  2 of 3 engines
  7. api ➞ RTCEncodedVideoFrame ➞ RTCEncodedVideoFrame ➞ options_metadata_receiveTime_parameter Spec link
    Added to Firefox  ➞  2 of 3 engines
  8. api ➞ RTCEncodedVideoFrame ➞ getMetadata ➞ return_object_property_receiveTime Spec link
    Added to Firefox  ➞  2 of 3 engines
  9. api ➞ RTCPeerConnection ➞ RTCPeerConnection ➞ configuration_rtcpMuxPolicy_parameter Spec link
    Added to Firefox  ➞  3 of 3 engines
  10. api ➞ AnimationEvent ➞ animation Spec link
    Added to Firefox  ➞  1 of 3 engines
  11. api ➞ Element ➞ getAnimations ➞ options_parameter ➞ pseudoElement_option Spec link
    Added to Firefox  ➞  1 of 3 engines
  12. api ➞ TransitionEvent ➞ animation Spec link
    Added to Firefox  ➞  1 of 3 engines

CSS

  1. css ➞ properties ➞ field-sizing
    Added to Firefox  ➞  3 of 3 engines
  2. css ➞ properties ➞ field-sizing ➞ content Spec link
    Added to Firefox  ➞  3 of 3 engines
  3. css ➞ properties ➞ field-sizing ➞ fixed Spec link
    Added to Firefox  ➞  3 of 3 engines

MATHML

  1. mathml ➞ elements ➞ a Spec link
    Added to Firefox  ➞  1 of 3 engines
  2. mathml ➞ elements ➞ a ➞ href Spec link
    Added to Firefox  ➞  1 of 3 engines

BCD Metadata Changes: 12

Show all 12 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 (4)

The entries in this section saw support information change since the report on Friday, 15 May 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.

CSS

  1. css ➞ properties ➞ anchor-name ➞ position_after_layout Spec link
    Backfilled for Safari  ➞  2 of 3 engines
  2. css ➞ types ➞ timeline-range-name
    Backfilled for Firefox  ➞  3 of 3 engines
  3. css ➞ types ➞ timeline-range-name ➞ scroll
    Backfilled for Firefox  ➞  3 of 3 engines

API

  1. api ➞ Element ➞ getAnimations ➞ options_parameter
    Backfilled for Firefox  ➞  3 of 3 engines

New entries (8)

The entries in this section were not found in BCD on Friday, 15 May 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 ➞ AnimationEvent ➞ animation
  2. api ➞ Element ➞ getAnimations ➞ options_parameter
  3. api ➞ Element ➞ getAnimations ➞ options_parameter ➞ pseudoElement_option
  4. api ➞ TransitionEvent ➞ animation

CSS

  1. css ➞ types ➞ timeline-range-name
  2. css ➞ types ➞ timeline-range-name ➞ scroll

MATHML

  1. mathml ➞ elements ➞ a
  2. mathml ➞ elements ➞ a ➞ href

Removed entries (0)

No features were removed from bcd in this time period