LibWeb: Parse orphans CSS property

Author: https://github.com/Calme1709
Commit: 3d85532752
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6313
Reviewed-by: https://github.com/AtkinsSJ ✅

Libraries/LibWeb/CSS/Properties.json

@@ -2724,6 +2724,15 @@
       "integer [-∞,∞]"
     ]
   },
+  "orphans": {
+    "animation-type": "by-computed-value",
+    "inherited": true,
+    "initial": "2",
+    "valid-types": [
+      "integer [1,∞]"
+    ],
+    "__comment": "FIXME: We don't implement this property any further than compute time"
+  },
   "outline": {
     "affects-layout": false,
     "inherited": false,