diff --git a/components/config/prefs.rs b/components/config/prefs.rs
index 8a3c8595f1d..fabda028ba5 100644
--- a/components/config/prefs.rs
+++ b/components/config/prefs.rs
@@ -265,7 +265,7 @@ impl Preferences {
             dom_serviceworker_timeout_seconds: 60,
             dom_servo_helpers_enabled: false,
             dom_servoparser_async_html_tokenizer_enabled: false,
-            dom_shadowdom_enabled: false,
+            dom_shadowdom_enabled: true,
             dom_svg_enabled: false,
             dom_testable_crash_enabled: false,
             dom_testbinding_enabled: false,
diff --git a/tests/wpt/meta/__dir__.ini b/tests/wpt/meta/__dir__.ini
index f69cd94922b..9a3f520ac80 100644
--- a/tests/wpt/meta/__dir__.ini
+++ b/tests/wpt/meta/__dir__.ini
@@ -1 +1 @@
-prefs: ["dom_imagebitmap_enabled:true", "dom_offscreen_canvas_enabled:true", "dom_shadowdom_enabled:true", "dom_xpath_enabled:true", "dom_intersection_observer_enabled:true", "dom_resize_observer_enabled:true", "dom_notification_enabled:true", "dom_fontface_enabled:true"]
+prefs: ["dom_imagebitmap_enabled:true", "dom_offscreen_canvas_enabled:true", "dom_xpath_enabled:true", "dom_intersection_observer_enabled:true", "dom_resize_observer_enabled:true", "dom_notification_enabled:true", "dom_fontface_enabled:true"]
diff --git a/tests/wpt/mozilla/meta/__dir__.ini b/tests/wpt/mozilla/meta/__dir__.ini
index f69cd94922b..9a3f520ac80 100644
--- a/tests/wpt/mozilla/meta/__dir__.ini
+++ b/tests/wpt/mozilla/meta/__dir__.ini
@@ -1 +1 @@
-prefs: ["dom_imagebitmap_enabled:true", "dom_offscreen_canvas_enabled:true", "dom_shadowdom_enabled:true", "dom_xpath_enabled:true", "dom_intersection_observer_enabled:true", "dom_resize_observer_enabled:true", "dom_notification_enabled:true", "dom_fontface_enabled:true"]
+prefs: ["dom_imagebitmap_enabled:true", "dom_offscreen_canvas_enabled:true", "dom_xpath_enabled:true", "dom_intersection_observer_enabled:true", "dom_resize_observer_enabled:true", "dom_notification_enabled:true", "dom_fontface_enabled:true"]