diff --git a/Userland/Libraries/LibWeb/CSS/Identifiers.json b/Userland/Libraries/LibWeb/CSS/Identifiers.json
index a4588bae3f..60d52b3024 100644
--- a/Userland/Libraries/LibWeb/CSS/Identifiers.json
+++ b/Userland/Libraries/LibWeb/CSS/Identifiers.json
@@ -56,11 +56,14 @@
   "-libweb-palette-window",
   "-libweb-palette-window-text",
   "absolute",
+  "active",
+  "additive",
   "alias",
   "all",
   "all-scroll",
   "anywhere",
   "auto",
+  "back",
   "baseline",
   "blink",
   "block",
@@ -70,6 +73,7 @@
   "both",
   "bottom",
   "break-word",
+  "browser",
   "capitalize",
   "cell",
   "center",
@@ -91,6 +95,7 @@
   "crosshair",
   "currentcolor",
   "cursive",
+  "custom",
   "dark",
   "dashed",
   "decimal",
@@ -101,6 +106,7 @@
   "dotted",
   "double",
   "e-resize",
+  "enabled",
   "ew-resize",
   "fantasy",
   "fast",
@@ -114,31 +120,36 @@
   "from-font",
   "full-size-kana",
   "full-width",
+  "fullscreen",
   "grab",
   "grabbing",
   "grid",
   "groove",
   "help",
   "hidden",
+  "high",
   "high-quality",
   "hover",
   "infinite",
+  "initial-only",
   "inline",
   "inline-block",
   "inline-flex",
   "inline-table",
   "inset",
   "inside",
-  "interlace",
   "inter-character",
   "inter-word",
+  "interlace",
   "invert",
+  "inverted",
   "italic",
   "justify",
   "landscape",
   "large",
   "larger",
   "left",
+  "less",
   "light",
   "lighter",
   "line-through",
@@ -151,12 +162,15 @@
   "ltr",
   "medium",
   "middle",
+  "minimal-ui",
   "monospace",
+  "more",
   "move",
   "n-resize",
   "ne-resize",
   "nesw-resize",
   "no-drop",
+  "no-preference",
   "no-repeat",
   "none",
   "normal",
@@ -166,6 +180,7 @@
   "nw-resize",
   "nwse-resize",
   "oblique",
+  "opaque",
   "outset",
   "outside",
   "overline",
@@ -181,6 +196,7 @@
   "progress",
   "progressive",
   "rec2020",
+  "reduce",
   "relative",
   "repeat",
   "repeat-x",
@@ -215,10 +231,13 @@
   "space-between",
   "square",
   "srgb",
+  "standalone",
+  "standard",
   "static",
   "sticky",
   "stretch",
   "sub",
+  "subtractive",
   "super",
   "sw-resize",
   "table",