diff --git a/components/layout/stylesheets/servo.css b/components/layout/stylesheets/servo.css
index c025b19f364..cb206bbcd00 100644
--- a/components/layout/stylesheets/servo.css
+++ b/components/layout/stylesheets/servo.css
@@ -265,4 +265,8 @@ select {
   padding: 0 0.25em;
   /* Don't show a text cursor when hovering selected option */
   cursor: default;
+}
+
+slot {
+  display: contents;
 }
\ No newline at end of file
diff --git a/tests/wpt/meta/shadow-dom/directionality-001.tentative.html.ini b/tests/wpt/meta/shadow-dom/directionality-001.tentative.html.ini
deleted file mode 100644
index 8929df10f67..00000000000
--- a/tests/wpt/meta/shadow-dom/directionality-001.tentative.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[directionality-001.tentative.html]
-  expected: FAIL