diff --git a/Userland/Libraries/LibWeb/CSS/Identifiers.json b/Userland/Libraries/LibWeb/CSS/Identifiers.json
index c5e6718335b..dbbc891b0e4 100644
--- a/Userland/Libraries/LibWeb/CSS/Identifiers.json
+++ b/Userland/Libraries/LibWeb/CSS/Identifiers.json
@@ -58,12 +58,17 @@
   "absolute",
   "alias",
   "all-scroll",
+  "anywhere",
   "auto",
+  "baseline",
   "blink",
   "block",
   "bold",
   "bolder",
   "both",
+  "bottom",
+  "border-box",
+  "break-word",
   "capitalize",
   "cell",
   "center",
@@ -73,6 +78,7 @@
   "column",
   "column-reverse",
   "content",
+  "content-box",
   "context-menu",
   "copy",
   "crosshair",
@@ -102,6 +108,7 @@
   "inline-block",
   "inset",
   "inside",
+  "invert",
   "italic",
   "justify",
   "large",
@@ -115,6 +122,7 @@
   "lower-latin",
   "lower-roman",
   "medium",
+  "middle",
   "monospace",
   "move",
   "ne-resize",
@@ -157,11 +165,14 @@
   "solid",
   "space",
   "space-around",
+  "s-resize",
   "space-between",
   "square",
-  "s-resize",
   "static",
   "sticky",
+  "stretch",
+  "sub",
+  "super",
   "sw-resize",
   "table",
   "table-caption",
@@ -173,6 +184,9 @@
   "table-row",
   "table-row-group",
   "text",
+  "text-bottom",
+  "text-top",
+  "top",
   "ui-monospace",
   "ui-rounded",
   "ui-sans-serif",
diff --git a/Userland/Libraries/LibWeb/CSS/Properties.json b/Userland/Libraries/LibWeb/CSS/Properties.json
index ac68d6ff5c2..2652c9332f8 100644
--- a/Userland/Libraries/LibWeb/CSS/Properties.json
+++ b/Userland/Libraries/LibWeb/CSS/Properties.json
@@ -1,4 +1,8 @@
 {
+  "align-items": {
+    "inherited": false,
+    "initial": "normal"
+  },
   "background": {},
   "background-attachment": {
     "inherited": false,
@@ -217,10 +221,14 @@
       "unitless-length"
     ]
   },
-  "box-shadow":{
+  "box-shadow": {
     "inherited": false,
     "initial": "none"
   },
+  "box-sizing": {
+    "inherited": false,
+    "initial": "content-box"
+  },
   "caption-side": {
     "inherited": true,
     "initial": "top"
@@ -255,6 +263,10 @@
     "inherited": false,
     "initial": "inline"
   },
+  "fill": {
+    "inherited": true,
+    "initial": "black"
+  },
   "flex": {
     "longhands": [
       "flex-grow",
@@ -443,6 +455,26 @@
     "inherited": false,
     "initial": "1"
   },
+  "outline": {
+    "inherited": false,
+    "longhands": [
+      "outline-color",
+      "outline-style",
+      "outline-width"
+    ]
+  },
+  "outline-color": {
+    "inherited": false,
+    "initial": "invert"
+  },
+  "outline-style": {
+    "inherited": false,
+    "initial": "none"
+  },
+  "outline-width": {
+    "inherited": false,
+    "initial": "medium"
+  },
   "overflow": {
     "longhands": [
       "overflow-x",
@@ -498,6 +530,10 @@
       "unitless-length"
     ]
   },
+  "pointer-events": {
+    "inherited": true,
+    "initial": "auto"
+  },
   "position": {
     "inherited": false,
     "initial": "static"
@@ -558,6 +594,10 @@
       "unitless-length"
     ]
   },
+  "user-select": {
+    "inherited": false,
+    "initial": "auto"
+  },
   "vertical-align": {
     "inherited": false,
     "initial": "baseline",
@@ -587,6 +627,10 @@
       "unitless-length"
     ]
   },
+  "word-wrap": {
+    "inherited": true,
+    "initial": "normal"
+  },
   "z-index": {
     "inherited": false,
     "initial": "auto"