Bug 1801123 - Enable container queries on nightly. r=dshin

There's only one worrying timeout
(css/css-contain/container-queries/inline-size-bfc-floats.html), but it
isn't a "hard" hang, but an invalidation loop.

Let's enable this by default on nightly to get some feedback while we
work on it and the remaining issues that block enabling them by default.

Differential Revision: https://phabricator.services.mozilla.com/D162292

devtools/shared/css/generated/properties-db.js

@@ -6119,6 +6119,57 @@ exports.CSS_PROPERTIES = {
       "unset"
     ]
   },
+  "container": {
+    "isInherited": false,
+    "subproperties": [
+      "container-name",
+      "container-type"
+    ],
+    "supports": [],
+    "values": [
+      "inherit",
+      "initial",
+      "inline-size",
+      "none",
+      "normal",
+      "revert",
+      "revert-layer",
+      "size",
+      "unset"
+    ]
+  },
+  "container-name": {
+    "isInherited": false,
+    "subproperties": [
+      "container-name"
+    ],
+    "supports": [],
+    "values": [
+      "inherit",
+      "initial",
+      "none",
+      "revert",
+      "revert-layer",
+      "unset"
+    ]
+  },
+  "container-type": {
+    "isInherited": false,
+    "subproperties": [
+      "container-type"
+    ],
+    "supports": [],
+    "values": [
+      "inherit",
+      "initial",
+      "inline-size",
+      "normal",
+      "revert",
+      "revert-layer",
+      "size",
+      "unset"
+    ]
+  },
   "content": {
     "isInherited": false,
     "subproperties": [

dom/tests/mochitest/general/test_interfaces.js

@@ -277,6 +277,8 @@ let interfaceNamesInGlobalScope = [
   // IMPORTANT: Do not change this list without review from a DOM peer!
   { name: "CSSConditionRule", insecureContext: true },
   // IMPORTANT: Do not change this list without review from a DOM peer!
+  { name: "CSSContainerRule", insecureContext: true, nightly: true },
+  // IMPORTANT: Do not change this list without review from a DOM peer!
   { name: "CSSCounterStyleRule", insecureContext: true },
   // IMPORTANT: Do not change this list without review from a DOM peer!
   { name: "CSSFontFaceRule", insecureContext: true },

modules/libpref/init/StaticPrefList.yaml

@@ -7978,7 +7978,7 @@
 # Whether Container Queries are enabled
 - name: layout.css.container-queries.enabled
   type: RelaxedAtomicBool
-  value: false
+  value: @IS_NIGHTLY_BUILD@
   mirror: always
   rust: true