diff --git a/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml b/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
index de3041001872..cf8c9ce990c3 100644
--- a/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
+++ b/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
@@ -750,11 +750,11 @@ ImperativeSlotAPIEnabled:
   humanReadableDescription: "Imperative Shadow DOM Distribution API"
   defaultValue:
     WebKitLegacy:
-      default: false
+      default: true
     WebKit:
-      default: false
+      default: true
     WebCore:
-      default: false
+      default: true
 
 # FIXME: This is not relevent for WebKitLegacy, so should be excluded from WebKitLegacy entirely.
 InProcessCookieCacheEnabled:
diff --git a/Source/WebCore/features.json b/Source/WebCore/features.json
index 355e2a8a06ad..8db9ce7e8445 100644
--- a/Source/WebCore/features.json
+++ b/Source/WebCore/features.json
@@ -1594,8 +1594,7 @@
     {
         "name": "Imperative Slot API",
         "status": {
-            "status": "In Development",
-            "enabled-by-default": false
+            "status": "Supported"
         },
         "specification": "Web Components",
         "category": "webapps",