BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +1, -0

Support increases (1)

API

  1. api ➞ PerformanceResourceTiming ➞ deliveryType ➞ navigational-prefetch
    Added to Safari  ➞  2 of 3 engines

BCD Metadata Changes: 30

Show all 30 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 (16)

The entries in this section saw support information change since the report on Friday, 8 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 ➞ selectors ➞ -webkit-scrollbar
    Backfilled for Firefox  ➞  3 of 3 engines
  2. css ➞ types ➞ url ➞ cross-origin Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  3. css ➞ types ➞ url ➞ referrer-policy Spec link
    Backfilled for Chrome  ➞  2 of 3 engines
  4. css ➞ types ➞ url ➞ integrity Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

API

  1. api ➞ AuthenticatorAttestationResponse ➞ getPublicKey ➞ algorithm_eddsa Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  2. api ➞ AuthenticatorAttestationResponse ➞ getPublicKey ➞ algorithm_es256 Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. api ➞ AuthenticatorAttestationResponse ➞ getPublicKey ➞ algorithm_rs256 Spec link
    Backfilled for Firefox  ➞  2 of 3 engines
  4. api ➞ Element ➞ attachShadow ➞ options_slotAssignment_parameter Spec link
    Backfilled for Firefox  ➞  3 of 3 engines

HTTP

  1. http ➞ headers ➞ Reporting-Endpoints ➞ default Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  2. http ➞ headers ➞ Reporting-Endpoints ➞ default ➞ receives_crash_type Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  3. http ➞ headers ➞ Reporting-Endpoints ➞ default ➞ receives_deprecation_type Spec link
    Backfilled for Firefox  ➞  3 of 3 engines

WEBASSEMBLY

  1. webassembly ➞ api ➞ Global ➞ Global ➞ mutable Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  2. webassembly ➞ definitions ➞ global
    Backfilled for Firefox  ➞  3 of 3 engines
  3. webassembly ➞ definitions ➞ global ➞ mut Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  4. webassembly ➞ instructions ➞ global_get Spec link
    Backfilled for Firefox  ➞  3 of 3 engines
  5. webassembly ➞ instructions ➞ global_set Spec link
    Backfilled for Firefox  ➞  3 of 3 engines

New entries (13)

The entries in this section were not found in BCD on Friday, 8 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 ➞ AuthenticatorAttestationResponse ➞ getPublicKey ➞ algorithm_eddsa
  2. api ➞ AuthenticatorAttestationResponse ➞ getPublicKey ➞ algorithm_es256
  3. api ➞ AuthenticatorAttestationResponse ➞ getPublicKey ➞ algorithm_rs256
  4. api ➞ Element ➞ attachShadow ➞ options_slotAssignment_parameter

CSS

  1. css ➞ types ➞ url ➞ integrity

HTTP

  1. http ➞ headers ➞ Reporting-Endpoints ➞ default
  2. http ➞ headers ➞ Reporting-Endpoints ➞ default ➞ receives_crash_type
  3. http ➞ headers ➞ Reporting-Endpoints ➞ default ➞ receives_deprecation_type

WEBASSEMBLY

  1. webassembly ➞ api ➞ Global ➞ Global ➞ mutable
  2. webassembly ➞ definitions ➞ global
  3. webassembly ➞ definitions ➞ global ➞ mut
  4. webassembly ➞ instructions ➞ global_get
  5. webassembly ➞ instructions ➞ global_set

Removed entries (1)

The entries in this section were found in BCD on Friday, 8 May 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.

WEBASSEMBLY

  1. webassembly ➞ mutable-globals