Bug 1745378 - Enable form-associated custom elements by default; r=smaug,annevk

Differential Revision: https://phabricator.services.mozilla.com/D135578

modules/libpref/init/StaticPrefList.yaml

@@ -3974,7 +3974,7 @@
 # Is support for form-associated custom element enabled?
 - name: dom.webcomponents.formAssociatedCustomElement.enabled
   type: bool
-  value: @IS_NIGHTLY_BUILD@
+  value: true
   mirror: always
 
 # Is support for the Web GPU API enabled?

testing/web-platform/meta/html/dom/idlharness.https.html.ini

@@ -91,10 +91,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [OffscreenCanvasRenderingContext2D interface: operation bezierCurveTo(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double)]
     expected: FAIL
 
-  [ElementInternals interface: operation reportValidity()]
-    expected:
-      if release_or_beta: FAIL
-
   [VideoTrackList interface object length]
     expected: FAIL
 
@@ -107,10 +103,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [OffscreenCanvasRenderingContext2D interface: attribute shadowColor]
     expected: FAIL
 
-  [ElementInternals interface: operation checkValidity()]
-    expected:
-      if release_or_beta: FAIL
-
   [TextMetrics interface: attribute emHeightDescent]
     expected: FAIL
 
@@ -279,10 +271,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [OffscreenCanvasRenderingContext2D interface object name]
     expected: FAIL
 
-  [ElementInternals interface: attribute labels]
-    expected:
-      if release_or_beta: FAIL
-
   [AudioTrack interface: attribute id]
     expected: FAIL
 
@@ -322,10 +310,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [SVGSVGElement interface: attribute onrejectionhandled]
     expected: FAIL
 
-  [ElementInternals interface: attribute form]
-    expected:
-      if release_or_beta: FAIL
-
   [Navigator interface: operation unregisterProtocolHandler(DOMString, USVString)]
     expected: FAIL
 
@@ -356,10 +340,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [AudioTrack interface: attribute kind]
     expected: FAIL
 
-  [ElementInternals interface: attribute willValidate]
-    expected:
-      if release_or_beta: FAIL
-
   [OffscreenCanvasRenderingContext2D interface: operation moveTo(unrestricted double, unrestricted double)]
     expected: FAIL
 
@@ -504,10 +484,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [CanvasRenderingContext2D interface: document.createElement("canvas").getContext("2d") must inherit property "scrollPathIntoView()" with the proper type]
     expected: FAIL
 
-  [ElementInternals interface: attribute validationMessage]
-    expected:
-      if release_or_beta: FAIL
-
   [AudioTrack interface: existence and properties of interface prototype object's "constructor" property]
     expected: FAIL
 
@@ -520,10 +496,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [External interface: existence and properties of interface prototype object's @@unscopables property]
     expected: FAIL
 
-  [ElementInternals interface: attribute validity]
-    expected:
-      if release_or_beta: FAIL
-
   [SVGElement interface: attribute autofocus]
     expected: FAIL
 
@@ -539,10 +511,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [OffscreenCanvasRenderingContext2D interface: operation fillText(DOMString, unrestricted double, unrestricted double, optional unrestricted double)]
     expected: FAIL
 
-  [ElementInternals interface: operation setFormValue((File or USVString or FormData)?, optional (File or USVString or FormData)?)]
-    expected:
-      if release_or_beta: FAIL
-
   [OffscreenCanvasRenderingContext2D interface: operation ellipse(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, optional boolean)]
     expected: FAIL
 
@@ -570,10 +538,6 @@ prefs: [dom.security.featurePolicy.experimental.enabled:true, dom.security.featu
   [OffscreenCanvasRenderingContext2D interface: operation arc(unrestricted double, unrestricted double, unrestricted double, unrestricted double, unrestricted double, optional boolean)]
     expected: FAIL
 
-  [ElementInternals interface: operation setValidity(optional ValidityStateFlags, optional DOMString, optional HTMLElement)]
-    expected:
-      if release_or_beta: FAIL
-
   [Navigator interface: operation registerProtocolHandler(DOMString, USVString)]
     expected:
       if (os == "mac") and not debug: [PASS, FAIL]