Narrow declared type of document.body to HTMLBodyElement | HTMLFrameSetElement

Author: Andarist

baselines/dom.generated.d.ts

@@ -4147,7 +4147,7 @@ interface Document extends Node, NonElementParentNode, DocumentOrShadowRoot, Par
     /**
      * Specifies the beginning and end of the document body.
      */
-    body: HTMLElement;
+    body: HTMLBodyElement | HTMLFrameSetElement;
     /**
      * Returns document's encoding.
      */

inputfiles/overridingTypes.json

@@ -625,7 +625,8 @@
                             "nullable": false
                         },
                         "body": {
-                            "nullable": false
+                            "nullable": false,
+                            "override-type": "HTMLBodyElement | HTMLFrameSetElement"
                        }
                     }
                 }