diff --git a/components/script/dom/servoparser/mod.rs b/components/script/dom/servoparser/mod.rs
index 976c1c6eb79..23ef1bab3ef 100644
--- a/components/script/dom/servoparser/mod.rs
+++ b/components/script/dom/servoparser/mod.rs
@@ -1462,7 +1462,7 @@ impl TreeSink for Sink {
             clonable,
             serializable,
             delegatesfocus,
-            SlotAssignmentMode::Manual,
+            SlotAssignmentMode::Named,
             CanGc::note(),
         ) {
             Ok(shadow_root) => {
diff --git a/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-basic.html.ini b/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-basic.html.ini
deleted file mode 100644
index 9ea3d57e32a..00000000000
--- a/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-basic.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[declarative-shadow-dom-basic.html]
-  [Declarative Shadow DOM: Basic test]
-    expected: FAIL
-
-  [Declarative Shadow DOM: Fragment parser basic test]
-    expected: FAIL
diff --git a/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-repeats.html.ini b/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-repeats.html.ini
deleted file mode 100644
index 4fad73d8d8c..00000000000
--- a/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-repeats.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[declarative-shadow-dom-repeats.html]
-  [Calling attachShadow() on declarative shadow root must match all parameters]
-    expected: FAIL
diff --git a/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-write-to-iframe.html.ini b/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-write-to-iframe.html.ini
deleted file mode 100644
index 81cb59eb03e..00000000000
--- a/tests/wpt/meta/shadow-dom/declarative/declarative-shadow-dom-write-to-iframe.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[declarative-shadow-dom-write-to-iframe.html]
-  [`document.write` on inner iframe handles declarative shadow DOM]
-    expected: FAIL