diff --git a/Userland/Libraries/LibWeb/CSS/Enums.json b/Userland/Libraries/LibWeb/CSS/Enums.json
index d46f8f15df..e006111bf8 100644
--- a/Userland/Libraries/LibWeb/CSS/Enums.json
+++ b/Userland/Libraries/LibWeb/CSS/Enums.json
@@ -89,7 +89,9 @@
         "crisp-edges",
         "high-quality",
         "pixelated",
-        "smooth"
+        "smooth",
+        "optimizespeed=pixelated",
+        "optimizequality=smooth"
     ],
     "justify-content": [
         "flex-start",
diff --git a/Userland/Libraries/LibWeb/CSS/Identifiers.json b/Userland/Libraries/LibWeb/CSS/Identifiers.json
index 60d52b3024..a1c9460ec3 100644
--- a/Userland/Libraries/LibWeb/CSS/Identifiers.json
+++ b/Userland/Libraries/LibWeb/CSS/Identifiers.json
@@ -181,6 +181,8 @@
   "nwse-resize",
   "oblique",
   "opaque",
+  "optimizespeed",
+  "optimizequality",
   "outset",
   "outside",
   "overline",