Summary of BCD changes from through π
Browser Support Changes: +4, -0
Support increases (4)
HTML
-
html β elements β script β type β speculationrules β tag
Added to Chrome β 1 of 3 engines
HTTP
-
http β headers β Set-Login
Added to Firefox β 2 of 3 engines -
http β headers β Sec-Speculation-Tags
Added to Chrome β 1 of 3 engines
JAVASCRIPT
-
javascript β builtins β Iterator β Iterator
Added to Safari β 3 of 3 engines
BCD Metadata Changes: 191
Show all 191 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 (36)
The entries in this section saw support information change since the report on Friday, 4 April 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
-
api β Notification β actions
Backfilled for Firefox β 2 of 3 engines -
api β CustomElementRegistry β define β connectedMoveCallback_lifecycle_callback
Backfilled for Chrome β 1 of 3 engines -
api β EventTarget β when
Backfilled for Chrome β 1 of 3 engines -
api β Observable β Observable
Backfilled for Chrome β 1 of 3 engines -
api β Observable
Backfilled for Chrome β 1 of 3 engines -
api β Observable β catch
Backfilled for Chrome β 1 of 3 engines -
api β Observable β drop
Backfilled for Chrome β 1 of 3 engines -
api β Observable β every
Backfilled for Chrome β 1 of 3 engines -
api β Observable β filter
Backfilled for Chrome β 1 of 3 engines -
api β Observable β finally
Backfilled for Chrome β 1 of 3 engines -
api β Observable β find
Backfilled for Chrome β 1 of 3 engines -
api β Observable β first
Backfilled for Chrome β 1 of 3 engines -
api β Observable β flatMap
Backfilled for Chrome β 1 of 3 engines -
api β Observable β forEach
Backfilled for Chrome β 1 of 3 engines -
api β Observable β from_static
Backfilled for Chrome β 1 of 3 engines -
api β Observable β inspect
Backfilled for Chrome β 1 of 3 engines -
api β Observable β last
Backfilled for Chrome β 1 of 3 engines -
api β Observable β map
Backfilled for Chrome β 1 of 3 engines -
api β Observable β reduce
Backfilled for Chrome β 1 of 3 engines -
api β Observable β some
Backfilled for Chrome β 1 of 3 engines -
api β Observable β subscribe
Backfilled for Chrome β 1 of 3 engines -
api β Observable β switchMap
Backfilled for Chrome β 1 of 3 engines -
api β Observable β take
Backfilled for Chrome β 1 of 3 engines -
api β Observable β takeUntil
Backfilled for Chrome β 1 of 3 engines -
api β Observable β toArray
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber β active
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber β addTeardown
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber β complete
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber β error
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber β next
Backfilled for Chrome β 1 of 3 engines -
api β Subscriber β signal
Backfilled for Chrome β 1 of 3 engines
CSS
-
css β properties β text-wrap β pretty
Backfilled for Safari β 2 of 3 engines
HTTP
-
http β headers β Reporting-Endpoints
Backfilled for Safari β 3 of 3 engines -
http β headers β Permissions-Policy β deferred-fetch
Backfilled for Chrome β 1 of 3 engines -
http β headers β Permissions-Policy β deferred-fetch-minimal
Backfilled for Chrome β 1 of 3 engines
New entries (35)
The entries in this section were not found in BCD on Friday, 4 April 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 (βRemoved BCD entriesβ) because of a Working Group deciding on a rename.
API
- api β CustomElementRegistry β define β connectedMoveCallback_lifecycle_callback
- api β EventTarget β when
- api β Observable β Observable
- api β Observable
- api β Observable β catch
- api β Observable β drop
- api β Observable β every
- api β Observable β filter
- api β Observable β finally
- api β Observable β find
- api β Observable β first
- api β Observable β flatMap
- api β Observable β forEach
- api β Observable β from_static
- api β Observable β inspect
- api β Observable β last
- api β Observable β map
- api β Observable β reduce
- api β Observable β some
- api β Observable β subscribe
- api β Observable β switchMap
- api β Observable β take
- api β Observable β takeUntil
- api β Observable β toArray
- api β Subscriber
- api β Subscriber β active
- api β Subscriber β addTeardown
- api β Subscriber β complete
- api β Subscriber β error
- api β Subscriber β next
- api β Subscriber β signal
HTML
- html β elements β script β type β speculationrules β tag
HTTP
- http β headers β Permissions-Policy β deferred-fetch
- http β headers β Permissions-Policy β deferred-fetch-minimal
- http β headers β Sec-Speculation-Tags
Removed entries (120)
The entries in this section were found in BCD on Friday, 4 April 2025, 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.
API
- api β HTMLHeadElement β profile
- api β SVGCursorElement
- api β SVGFontElement
- api β SVGFontFaceElement
- api β SVGFontFaceFormatElement
- api β SVGFontFaceNameElement
- api β SVGFontFaceSrcElement
- api β SVGFontFaceUriElement
- api β SVGGlyphElement
- api β SVGGlyphRefElement
- api β SVGGlyphRefElement β dx
- api β SVGGlyphRefElement β dy
- api β SVGGlyphRefElement β format
- api β SVGGlyphRefElement β glyphRef
- api β SVGGlyphRefElement β href
- api β SVGGlyphRefElement β x
- api β SVGGlyphRefElement β y
- api β SVGHKernElement
- api β SVGMissingGlyphElement
- api β SVGTRefElement
- api β SVGVKernElement
- api β Window β showModalDialog
HTML
- html β elements β head β profile
- html β elements β pre β wrap
SVG
- svg β elements β cursor
- svg β elements β cursor β href
- svg β elements β cursor β systemLanguage
- svg β elements β cursor β x
- svg β elements β cursor β xlink_href
- svg β elements β cursor β y
- svg β elements β font
- svg β elements β font β horiz-adv-x
- svg β elements β font β horiz-origin-x
- svg β elements β font β horiz-origin-y
- svg β elements β font β vert-adv-y
- svg β elements β font β vert-origin-x
- svg β elements β font β vert-origin-y
- svg β elements β font-face
- svg β elements β font-face β accent-height
- svg β elements β font-face β alphabetic
- svg β elements β font-face β ascent
- svg β elements β font-face β bbox
- svg β elements β font-face β cap-height
- svg β elements β font-face β descent
- svg β elements β font-face β font-family
- svg β elements β font-face β font-size
- svg β elements β font-face β font-stretch
- svg β elements β font-face β font-style
- svg β elements β font-face β font-variant
- svg β elements β font-face β font-weight
- svg β elements β font-face β hanging
- svg β elements β font-face β ideographic
- svg β elements β font-face β mathematical
- svg β elements β font-face β overline-position
- svg β elements β font-face β overline-thickness
- svg β elements β font-face β panose-1
- svg β elements β font-face β slope
- svg β elements β font-face β stemh
- svg β elements β font-face β stemv
- svg β elements β font-face β strikethrough-position
- svg β elements β font-face β strikethrough-thickness
- svg β elements β font-face β underline-position
- svg β elements β font-face β underline-thickness
- svg β elements β font-face β unicode-range
- svg β elements β font-face β units-per-em
- svg β elements β font-face β v-alphabetic
- svg β elements β font-face β v-hanging
- svg β elements β font-face β v-ideographic
- svg β elements β font-face β v-mathematical
- svg β elements β font-face β widths
- svg β elements β font-face β x-height
- svg β elements β font-face-format
- svg β elements β font-face-format β string
- svg β elements β font-face-name
- svg β elements β font-face-name β name
- svg β elements β font-face-src
- svg β elements β font-face-uri
- svg β elements β font-face-uri β xlink_href
- svg β elements β glyph
- svg β elements β glyph β arabic-form
- svg β elements β glyph β d
- svg β elements β glyph β glyph-name
- svg β elements β glyph β horiz-adv-x
- svg β elements β glyph β lang
- svg β elements β glyph β orientation
- svg β elements β glyph β unicode
- svg β elements β glyph β vert-adv-y
- svg β elements β glyph β vert-origin-x
- svg β elements β glyph β vert-origin-y
- svg β elements β glyphRef
- svg β elements β glyphRef β dx
- svg β elements β glyphRef β dy
- svg β elements β glyphRef β format
- svg β elements β glyphRef β glyphRef
- svg β elements β glyphRef β x
- svg β elements β glyphRef β xlink_href
- svg β elements β glyphRef β y
- svg β elements β hkern
- svg β elements β hkern β g1
- svg β elements β hkern β g2
- svg β elements β hkern β k
- svg β elements β hkern β u1
- svg β elements β hkern β u2
- svg β elements β missing-glyph
- svg β elements β missing-glyph β d
- svg β elements β missing-glyph β horiz-adv-x
- svg β elements β missing-glyph β vert-adv-y
- svg β elements β missing-glyph β vert-origin-x
- svg β elements β missing-glyph β vert-origin-y
- svg β elements β tref
- svg β elements β tref β fill
- svg β elements β tref β fill β context-fill
- svg β elements β tref β systemLanguage
- svg β elements β tref β xlink_href
- svg β elements β vkern
- svg β elements β vkern β g1
- svg β elements β vkern β g2
- svg β elements β vkern β k
- svg β elements β vkern β u1
- svg β elements β vkern β u2