BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +6, -0

Support increases (6)

CSS

  1. css ➞ properties ➞ background-position-x ➞ side-relative_values
    Added to Chrome  ➞  3 of 3 engines
  2. css ➞ properties ➞ background-position-y ➞ side-relative_values
    Added to Chrome  ➞  3 of 3 engines
  3. css ➞ properties ➞ math-shift
    Added to Firefox  ➞  3 of 3 engines

HTML

  1. html ➞ elements ➞ h1 ➞ no_ua_styles_in_article_aside_nav_section
    Added to Safari  ➞  2 of 3 engines

JAVASCRIPT

  1. javascript ➞ builtins ➞ WeakMap ➞ symbol_as_keys
    Added to Firefox  ➞  3 of 3 engines
  2. javascript ➞ builtins ➞ WeakSet ➞ symbol_as_keys
    Added to Firefox  ➞  3 of 3 engines

BCD Metadata Changes: 28

Show all 28 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 (15)

The entries in this section saw support information change since the report on Monday, 17 November 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 ➞ CustomElementRegistry ➞ define ➞ connectedMoveCallback_lifecycle_callback Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  2. api ➞ Navigator ➞ canShare ➞ data_text_parameter Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. api ➞ HTMLAnchorElement ➞ interestForElement
    Backfilled for Chrome  ➞  1 of 3 engines
  4. api ➞ HTMLAreaElement ➞ interestForElement
    Backfilled for Chrome  ➞  1 of 3 engines
  5. api ➞ HTMLButtonElement ➞ interestForElement
    Backfilled for Chrome  ➞  1 of 3 engines
  6. api ➞ HTMLElement ➞ interest_event
    Backfilled for Chrome  ➞  1 of 3 engines
  7. api ➞ HTMLElement ➞ loseinterest_event
    Backfilled for Chrome  ➞  1 of 3 engines
  8. api ➞ InterestEvent ➞ InterestEvent
    Backfilled for Chrome  ➞  1 of 3 engines
  9. api ➞ InterestEvent
    Backfilled for Chrome  ➞  1 of 3 engines
  10. api ➞ InterestEvent ➞ source
    Backfilled for Chrome  ➞  1 of 3 engines
  11. api ➞ SVGAElement ➞ interestForElement
    Backfilled for Chrome  ➞  1 of 3 engines

HTML

  1. html ➞ elements ➞ a ➞ interestfor
    Backfilled for Chrome  ➞  1 of 3 engines
  2. html ➞ elements ➞ area ➞ interestfor
    Backfilled for Chrome  ➞  1 of 3 engines
  3. html ➞ elements ➞ button ➞ interestfor
    Backfilled for Chrome  ➞  1 of 3 engines

SVG

  1. svg ➞ elements ➞ a ➞ interestfor
    Backfilled for Chrome  ➞  1 of 3 engines

New entries (13)

The entries in this section were not found in BCD on Monday, 17 November 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 ➞ HTMLAnchorElement ➞ interestForElement
  2. api ➞ HTMLAreaElement ➞ interestForElement
  3. api ➞ HTMLButtonElement ➞ interestForElement
  4. api ➞ HTMLElement ➞ interest_event
  5. api ➞ HTMLElement ➞ loseinterest_event
  6. api ➞ InterestEvent ➞ InterestEvent
  7. api ➞ InterestEvent
  8. api ➞ InterestEvent ➞ source
  9. api ➞ SVGAElement ➞ interestForElement

HTML

  1. html ➞ elements ➞ a ➞ interestfor
  2. html ➞ elements ➞ area ➞ interestfor
  3. html ➞ elements ➞ button ➞ interestfor

SVG

  1. svg ➞ elements ➞ a ➞ interestfor

Removed entries (0)

No features were removed from bcd in this time period