diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
index fce52eb..d962f5c 100644
--- a/Source/WebCore/ChangeLog
+++ b/Source/WebCore/ChangeLog
@@ -1,3 +1,12 @@
+2019-10-17  Antoine Quint  <graouts@apple.com>
+
+        [Web Animations] Enable the Web Animations JavaScript API by default
+        https://bugs.webkit.org/show_bug.cgi?id=203075
+
+        Reviewed by Antti Koivisto.
+
+        * page/RuntimeEnabledFeatures.h:
+
 2019-10-17  Wenson Hsieh  <wenson_hsieh@apple.com>
 
         Unreviewed, fix watchOS and tvOS builds after r251224
diff --git a/Source/WebCore/page/RuntimeEnabledFeatures.h b/Source/WebCore/page/RuntimeEnabledFeatures.h
index 3d4c56b..c1273c0 100644
--- a/Source/WebCore/page/RuntimeEnabledFeatures.h
+++ b/Source/WebCore/page/RuntimeEnabledFeatures.h
@@ -405,7 +405,7 @@
     bool m_isCustomPasteboardDataEnabled { false };
     bool m_isWebShareEnabled { false };
     bool m_inputEventsEnabled { true };
-    bool m_areWebAnimationsEnabled { false };
+    bool m_areWebAnimationsEnabled { true };
     bool m_isWebAnimationsCSSIntegrationEnabled { false };
     bool m_isImageBitmapOffscreenCanvasEnabled { true };
     bool m_isCacheAPIEnabled { false };
diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index 955152b..499aa2c 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,12 @@
+2019-10-17  Antoine Quint  <graouts@apple.com>
+
+        [Web Animations] Enable the Web Animations JavaScript API by default
+        https://bugs.webkit.org/show_bug.cgi?id=203075
+
+        Reviewed by Antti Koivisto.
+
+        * Shared/WebPreferences.yaml:
+
 2019-10-17  Carlos Alberto Lopez Perez  <clopez@igalia.com>
 
         [GTK][WPE] File and Directory Entries API is not enabled
diff --git a/Source/WebKit/Shared/WebPreferences.yaml b/Source/WebKit/Shared/WebPreferences.yaml
index 4f0b6c6..76c6b00 100644
--- a/Source/WebKit/Shared/WebPreferences.yaml
+++ b/Source/WebKit/Shared/WebPreferences.yaml
@@ -1306,7 +1306,7 @@
 
 WebAnimationsEnabled:
   type: bool
-  defaultValue: DEFAULT_EXPERIMENTAL_FEATURES_ENABLED
+  defaultValue: true
   humanReadableName: "Web Animations"
   humanReadableDescription: "Web Animations prototype"
   category: experimental