Bug 1988225. Enable anchor positioning pref on all channels. r=layout-anchor-positioning-reviewers,webidl,emilio

Differential Revision: https://phabricator.services.mozilla.com/D274486

Author: jwatt

dom/tests/mochitest/general/test_interfaces.js

@@ -260,9 +260,9 @@ let interfaceNamesInGlobalScope = [
   // IMPORTANT: Do not change this list without review from a DOM peer!
   { name: "CSSPageRule", insecureContext: true },
   // IMPORTANT: Do not change this list without review from a DOM peer!
-  { name: "CSSPositionTryDescriptors", insecureContext: true, nightly: true },
+  { name: "CSSPositionTryDescriptors", insecureContext: true },
   // IMPORTANT: Do not change this list without review from a DOM peer!
-  { name: "CSSPositionTryRule", insecureContext: true, nightly: true },
+  { name: "CSSPositionTryRule", insecureContext: true },
   // IMPORTANT: Do not change this list without review from a DOM peer!
   { name: "CSSPropertyRule", insecureContext: true },
   // IMPORTANT: Do not change this list without review from a DOM peer!

modules/libpref/init/StaticPrefList.yaml

@@ -9900,7 +9900,7 @@
 # https://drafts.csswg.org/css-anchor-position-1/
 - name: layout.css.anchor-positioning.enabled
   type: RelaxedAtomicBool
-  value: @IS_NIGHTLY_BUILD@
+  value: true
   mirror: always
   rust: true