BCD Watch

BCD Changes Report

Summary of BCD changes from through 🔗

Browser Support Changes: +23, -0

Support increases (23)

API

  1. api ➞ CSSFontFaceRule ➞ style ➞ type_CSSFontFaceDescriptors
    Added to Firefox  ➞  2 of 3 engines
  2. api ➞ Document ➞ customElementRegistry
    Added to Firefox  ➞  3 of 3 engines
  3. api ➞ Element ➞ customElementRegistry
    Added to Firefox  ➞  3 of 3 engines
  4. api ➞ HTMLImageElement ➞ sizes ➞ auto Spec link
    Added to Firefox  ➞  2 of 3 engines
  5. api ➞ Origin ➞ Origin Spec link
    Added to Safari  ➞  2 of 3 engines
  6. api ➞ Origin Spec link
    Added to Safari  ➞  2 of 3 engines
  7. api ➞ Origin ➞ from_static Spec link
    Added to Safari  ➞  2 of 3 engines
  8. api ➞ Origin ➞ isSameOrigin Spec link
    Added to Safari  ➞  2 of 3 engines
  9. api ➞ Origin ➞ isSameSite Spec link
    Added to Safari  ➞  2 of 3 engines
  10. api ➞ Origin ➞ opaque Spec link
    Added to Safari  ➞  2 of 3 engines
  11. api ➞ PerformanceResourceTiming ➞ contentType
    Added to Chrome  ➞  2 of 3 engines
  12. api ➞ ShadowRoot ➞ customElementRegistry
    Added to Firefox  ➞  3 of 3 engines
  13. api ➞ ToggleEvent ➞ source
    Added to Safari  ➞  3 of 3 engines

HTML

  1. html ➞ elements ➞ video ➞ loading Spec link
    Added to Chrome  ➞  1 of 3 engines

MANIFESTS

  1. manifests ➞ webapp ➞ migrate_from Spec link
    Added to Chrome  ➞  1 of 3 engines
  2. manifests ➞ webapp ➞ migrate_to Spec link
    Added to Chrome  ➞  1 of 3 engines

WEBDRIVER

  1. webdriver ➞ bidi ➞ browser ➞ setClientWindowState Spec link
    Added to Firefox  ➞  2 of 3 engines
  2. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ clientWindow_parameter Spec link
    Added to Firefox  ➞  2 of 3 engines
  3. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ height_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  4. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ state_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  5. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ width_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  6. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ x_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines
  7. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ y_parameter Spec link
    Added to Firefox  ➞  1 of 3 engines

BCD Metadata Changes: 32

Show all 32 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 (13)

The entries in this section saw support information change since the report on Friday, 27 March 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 ➞ Element ➞ animate ➞ options_iterationComposite_parameter Spec link
    Backfilled for Safari  ➞  2 of 3 engines
  2. api ➞ Request ➞ targetAddressSpace Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  3. api ➞ Element ➞ attachShadow ➞ options_referenceTarget_parameter
    Backfilled for Firefox  ➞  3 of 3 engines
  4. api ➞ HTMLTemplateElement ➞ shadowRootReferenceTarget
    Backfilled for Firefox  ➞  3 of 3 engines
  5. api ➞ Permissions ➞ permission_local-network Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  6. api ➞ Permissions ➞ permission_local-network-access Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  7. api ➞ Permissions ➞ permission_loopback-network Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  8. api ➞ Request ➞ Request ➞ init_targetAddressSpace_parameter Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  9. api ➞ fetch ➞ init_targetAddressSpace_parameter Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

CSS

  1. css ➞ properties ➞ all ➞ revert-rule Spec link
    Backfilled for Safari  ➞  2 of 3 engines

HTTP

  1. http ➞ headers ➞ Permissions-Policy ➞ local-network Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  2. http ➞ headers ➞ Permissions-Policy ➞ local-network-access Spec link
    Backfilled for Chrome  ➞  1 of 3 engines
  3. http ➞ headers ➞ Permissions-Policy ➞ loopback-network Spec link
    Backfilled for Chrome  ➞  1 of 3 engines

New entries (18)

The entries in this section were not found in BCD on Friday, 27 March 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 ➞ Element ➞ attachShadow ➞ options_referenceTarget_parameter
  2. api ➞ HTMLTemplateElement ➞ shadowRootReferenceTarget
  3. api ➞ Permissions ➞ permission_local-network
  4. api ➞ Permissions ➞ permission_local-network-access
  5. api ➞ Permissions ➞ permission_loopback-network
  6. api ➞ Request ➞ Request ➞ init_targetAddressSpace_parameter
  7. api ➞ fetch ➞ init_targetAddressSpace_parameter

HTML

  1. html ➞ elements ➞ video ➞ loading

HTTP

  1. http ➞ headers ➞ Permissions-Policy ➞ local-network
  2. http ➞ headers ➞ Permissions-Policy ➞ local-network-access
  3. http ➞ headers ➞ Permissions-Policy ➞ loopback-network

MANIFESTS

  1. manifests ➞ webapp ➞ migrate_from
  2. manifests ➞ webapp ➞ migrate_to

WEBDRIVER

  1. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ height_parameter
  2. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ state_parameter
  3. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ width_parameter
  4. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ x_parameter
  5. webdriver ➞ bidi ➞ browser ➞ setClientWindowState ➞ y_parameter

Removed entries (1)

The entries in this section were found in BCD on Friday, 27 March 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.

HTML

  1. html ➞ elements ➞ video ➞ autoplay ➞ loading