diff --git a/Tests/LibWeb/Text/expected/css/getComputedStyle-print-all.txt b/Tests/LibWeb/Text/expected/css/getComputedStyle-print-all.txt
index bc4bd6fac59..10b40dbfbe3 100644
--- a/Tests/LibWeb/Text/expected/css/getComputedStyle-print-all.txt
+++ b/Tests/LibWeb/Text/expected/css/getComputedStyle-print-all.txt
@@ -166,6 +166,9 @@ transform: none
 transform-box: view-box
 transform-origin: 50% 50%
 transition-delay: 0s
+transition-duration: 0s
+transition-property: all
+transition-timing-function: ease
 user-select: auto
 vertical-align: baseline
 visibility: visible
diff --git a/Userland/Libraries/LibWeb/CSS/Properties.json b/Userland/Libraries/LibWeb/CSS/Properties.json
index ab9f38f8ce4..60483c98a57 100644
--- a/Userland/Libraries/LibWeb/CSS/Properties.json
+++ b/Userland/Libraries/LibWeb/CSS/Properties.json
@@ -2348,7 +2348,19 @@
     ],
     "percentages-resolve-to": "length"
   },
+  "transition": {
+    "affects-layout": true,
+    "inherited": false,
+    "initial": "none",
+    "longhands": [
+      "transition-property",
+      "transition-duration",
+      "transition-timing-function",
+      "transition-delay"
+    ]
+  },
   "transition-delay": {
+    "affects-layout": true,
     "animation-type": "none",
     "inherited": false,
     "initial": "0s",
@@ -2356,6 +2368,38 @@
       "time"
     ]
   },
+  "transition-duration": {
+    "affects-layout": true,
+    "animation-type": "none",
+    "inherited": false,
+    "initial": "0s",
+    "valid-types": [
+      "time"
+    ]
+  },
+  "transition-property": {
+    "affects-layout": true,
+    "animation-type": "none",
+    "inherited": false,
+    "initial": "all",
+    "valid-types": [
+      "string",
+      "custom-ident"
+    ],
+    "valid-identifiers": [
+      "all",
+      "none"
+    ]
+  },
+  "transition-timing-function": {
+    "affects-layout": true,
+    "animation-type": "none",
+    "inherited": false,
+    "initial": "ease",
+    "valid-types": [
+      "easing-function"
+    ]
+  },
   "user-select": {
     "affects-layout": false,
     "animation-type": "discrete",