diff --git a/devtools/shared/css/generated/properties-db.js b/devtools/shared/css/generated/properties-db.js
index fb95ffd1f1..fd8635bbfa 100644
--- a/devtools/shared/css/generated/properties-db.js
+++ b/devtools/shared/css/generated/properties-db.js
@@ -9826,6 +9826,7 @@ exports.CSS_PROPERTIES = {
 exports.PSEUDO_ELEMENTS = [
   ":after",
   ":before",
+  ":slotted",
   ":backdrop",
   ":first-letter",
   ":first-line",