Remove some compat quirk

baselines/dom.generated.d.ts

@@ -5683,7 +5683,7 @@ declare var CharacterData: {
     new(): CharacterData;
 };
 
-interface ChildNode extends Node {
+interface ChildNode {
     /**
      * Inserts nodes just after node, while replacing strings in nodes with equivalent Text nodes.
      *
@@ -15817,13 +15817,13 @@ interface Node extends EventTarget {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/childNodes)
      */
-    readonly childNodes: NodeListOf<ChildNode>;
+    readonly childNodes: NodeListOf<Node & ChildNode>;
     /**
      * Returns the first child.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/firstChild)
      */
-    readonly firstChild: ChildNode | null;
+    readonly firstChild: (Node & ChildNode) | null;
     /**
      * Returns true if node is connected and false otherwise.
      *
@@ -15835,13 +15835,13 @@ interface Node extends EventTarget {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/lastChild)
      */
-    readonly lastChild: ChildNode | null;
+    readonly lastChild: (Node & ChildNode) | null;
     /**
      * Returns the next sibling.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/nextSibling)
      */
-    readonly nextSibling: ChildNode | null;
+    readonly nextSibling: (Node & ChildNode) | null;
     /**
      * Returns a string appropriate for the type of node.
      *
@@ -15873,13 +15873,13 @@ interface Node extends EventTarget {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/parentNode)
      */
-    readonly parentNode: ParentNode | null;
+    readonly parentNode: (Node & ParentNode) | null;
     /**
      * Returns the previous sibling.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/previousSibling)
      */
-    readonly previousSibling: ChildNode | null;
+    readonly previousSibling: (Node & ChildNode) | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/textContent) */
     textContent: string | null;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Node/appendChild) */
@@ -16502,7 +16502,7 @@ declare var PannerNode: {
     new(context: BaseAudioContext, options?: PannerOptions): PannerNode;
 };
 
-interface ParentNode extends Node {
+interface ParentNode {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/Document/childElementCount) */
     readonly childElementCount: number;
     /**
@@ -20413,7 +20413,7 @@ declare var SVGSwitchElement: {
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/SVGSymbolElement)
  */
-interface SVGSymbolElement extends SVGElement, SVGFitToViewBox {
+interface SVGSymbolElement extends SVGGraphicsElement, SVGFitToViewBox {
     addEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof SVGElementEventMap>(type: K, listener: (this: SVGSymbolElement, ev: SVGElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;

inputfiles/overridingTypes.jsonc

@@ -1,12 +1,6 @@
 {
     "mixins": {
         "mixin": {
-            "ChildNode": {
-                "extends": "Node"
-            },
-            "ParentNode": {
-                "extends": "Node"
-            },
             "Animatable": {
                 "methods": {
                     "method": {
@@ -902,25 +896,25 @@
                 "properties": {
                     "property": {
                         "parentNode": {
-                            "overrideType": "ParentNode"
+                            "overrideType": "Node & ParentNode"
                         },
                         "parentElement": {
                             "overrideType": "HTMLElement"
                         },
                         "childNodes": {
-                            "overrideType": "NodeListOf<ChildNode>"
+                            "overrideType": "NodeListOf<Node & ChildNode>"
                         },
                         "firstChild": {
-                            "overrideType": "ChildNode"
+                            "overrideType": "Node & ChildNode"
                         },
                         "lastChild": {
-                            "overrideType": "ChildNode"
+                            "overrideType": "Node & ChildNode"
                         },
                         "nextSibling": {
-                            "overrideType": "ChildNode"
+                            "overrideType": "Node & ChildNode"
                         },
                         "previousSibling": {
-                            "overrideType": "ChildNode"
+                            "overrideType": "Node & ChildNode"
                         }
                     }
                 }
@@ -1268,9 +1262,6 @@
                     }
                 }
             },
-            "SVGSymbolElement": {
-                "extends": "SVGElement"
-            },
             "FormData": {
                 "methods": {
                     "method": {