diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 87a7e7c49..0b15338d9 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -3599,8 +3599,8 @@ interface Element extends Node, GlobalEventHandlers, ElementTraversal, NodeSelec
     getAttributeNode(name: string): Attr;
     getAttributeNodeNS(namespaceURI: string, localName: string): Attr;
     getAttributeNS(namespaceURI: string, localName: string): string;
-    getBoundingClientRect(): ClientRect;
-    getClientRects(): ClientRectList;
+    getBoundingClientRect(): ClientRect | DOMRect;
+    getClientRects(): ClientRectList | DOMRectList;
     getElementsByTagName<K extends keyof HTMLElementTagNameMap>(name: K): NodeListOf<HTMLElementTagNameMap[K]>;
     getElementsByTagName<K extends keyof SVGElementTagNameMap>(name: K): NodeListOf<SVGElementTagNameMap[K]>;
     getElementsByTagName(name: string): NodeListOf<Element>;
@@ -4898,6 +4898,7 @@ interface HTMLFormElement extends HTMLElement {
      */
     submit(): void;
     reportValidity(): boolean;
+    reportValidity(): boolean;
     addEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | AddEventListenerOptions): void;
     addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
     removeEventListener<K extends keyof HTMLElementEventMap>(type: K, listener: (this: HTMLFormElement, ev: HTMLElementEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
@@ -7367,10 +7368,10 @@ declare var IntersectionObserver: {
 };
 
 interface IntersectionObserverEntry {
-    readonly boundingClientRect: ClientRect;
+    readonly boundingClientRect: ClientRect | DOMRect;
     readonly intersectionRatio: number;
-    readonly intersectionRect: ClientRect;
-    readonly rootBounds: ClientRect;
+    readonly intersectionRect: ClientRect | DOMRect;
+    readonly rootBounds: ClientRect | DOMRect;
     readonly target: Element;
     readonly time: number;
     readonly isIntersecting: boolean;
@@ -9168,8 +9169,8 @@ interface Range {
     detach(): void;
     expand(Unit: ExpandGranularity): boolean;
     extractContents(): DocumentFragment;
-    getBoundingClientRect(): ClientRect;
-    getClientRects(): ClientRectList;
+    getBoundingClientRect(): ClientRect | DOMRect;
+    getClientRects(): ClientRectList | DOMRectList;
     insertNode(newNode: Node): void;
     selectNode(refNode: Node): void;
     selectNodeContents(refNode: Node): void;
@@ -14662,6 +14663,23 @@ declare var HTMLSummaryElement: {
     new(): HTMLSummaryElement;
 };
 
+interface DOMRectReadOnly {
+    readonly bottom: number;
+    readonly height: number;
+    readonly left: number;
+    readonly right: number;
+    readonly top: number;
+    readonly width: number;
+    readonly x: number;
+    readonly y: number;
+}
+
+declare var DOMRectReadOnly: {
+    prototype: DOMRectReadOnly;
+    new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly;
+    fromRect(rectangle?: DOMRectInit): DOMRectReadOnly;
+};
+
 interface EXT_blend_minmax {
     readonly MIN_EXT: number;
     readonly MAX_EXT: number;
@@ -14680,6 +14698,25 @@ interface EXT_sRGB {
     readonly FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: number;
 }
 
+interface DOMRect extends DOMRectReadOnly {
+    height: number;
+    width: number;
+    x: number;
+    y: number;
+}
+
+declare var DOMRect: {
+    prototype: DOMRect;
+    new (x?: number, y?: number, width?: number, height?: number): DOMRect;
+    fromRect(rectangle?: DOMRectInit): DOMRect;
+};
+
+interface DOMRectList {
+    readonly length: number;
+    item(index: number): DOMRect | null;
+    [index: number]: DOMRect;
+}
+
 interface OES_vertex_array_object {
     readonly VERTEX_ARRAY_BINDING_OES: number;
     createVertexArrayOES(): WebGLVertexArrayObjectOES;
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index 89caf3d78..94bf9b507 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -1929,6 +1929,57 @@
         "extends": "HTMLElement",
         "flavor": "Web"
     },
+    {
+        "kind": "interface",
+        "name": "DOMRectReadOnly",
+        "flavor": "DOM",
+        "properties": [
+            {
+                "name": "bottom",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "height",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "left",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "right",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "top",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "width",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "x",
+                "readonly": true,
+                "type": "number"
+            },
+            {
+                "name": "y",
+                "readonly": true,
+                "type": "number"
+            }
+        ],
+        "constructorSignatures": [
+            "new (x?: number, y?: number, width?: number, height?: number): DOMRectReadOnly",
+            "fromRect(rectangle?: DOMRectInit): DOMRectReadOnly"
+        ]
+    },
     {
         "kind": "interface",
         "name": "EXT_blend_minmax",
@@ -1985,6 +2036,70 @@
             }
         ]
     },
+    {
+        "kind": "interface",
+        "name": "DOMRect",
+        "extends": "DOMRectReadOnly",
+        "flavor": "DOM",
+        "properties": [
+            {
+                "name": "height",
+                "type": "number"
+            },
+            {
+                "name": "width",
+                "type": "number"
+            },
+            {
+                "name": "x",
+                "type": "number"
+            },
+            {
+                "name": "y",
+                "type": "number"
+            }
+        ],
+        "constructorSignatures": [
+            "new (x?: number, y?: number, width?: number, height?: number): DOMRect",
+            "fromRect(rectangle?: DOMRectInit): DOMRect"
+        ]
+    },
+    {
+        "kind": "interface",
+        "name": "DOMRectList",
+        "flavor": "DOM",
+        "properties": [
+            {
+                "name": "length",
+                "type": "number",
+                "readonly": true
+            }
+        ],
+        "indexer": [
+            {
+                "signatures": [
+                    "[index: number]: DOMRect"
+                ]
+            }
+        ],
+        "methods": [
+            {
+                "name": "item",
+                "signatures": [
+                    "item(index: number): DOMRect | null"
+                ]
+            }
+        ]
+    },
+    {
+        "kind": "method",
+        "interface": "HTMLFormElement",
+        "name": "reportValidity",
+        "flavor": "DOM",
+        "signatures": [
+            "reportValidity(): boolean"
+        ]
+    },
     {
         "kind": "interface",
         "name": "OES_vertex_array_object",
diff --git a/inputfiles/overridingTypes.json b/inputfiles/overridingTypes.json
index b4643e728..1eeaf3928 100644
--- a/inputfiles/overridingTypes.json
+++ b/inputfiles/overridingTypes.json
@@ -1666,6 +1666,49 @@
             "getRegistration(clientURL?: USVString): Promise<ServiceWorkerRegistration | undefined>"
         ]
     },
+    {
+        "kind": "method",
+        "interface": "Element",
+        "name": "getBoundingClientRect",
+        "signatures": ["getBoundingClientRect(): ClientRect | DOMRect"]
+    },
+    {
+        "kind": "method",
+        "interface": "Element",
+        "name": "getClientRects",
+        "signatures": [
+            "getClientRects(): ClientRectList | DOMRectList"
+        ]
+    },
+    {
+        "kind": "property",
+        "interface": "IntersectionObserverEntry",
+        "name": "boundingClientRect",
+        "readonly": true,
+        "type": "ClientRect | DOMRect"
+    },
+    {
+        "kind": "property",
+        "interface": "IntersectionObserverEntry",
+        "name": "intersectionRect",
+        "readonly": true,
+        "type": "ClientRect | DOMRect"
+    },
+    {
+        "kind": "property",
+        "interface": "IntersectionObserverEntry",
+        "name": "rootBounds",
+        "readonly": true,
+        "type": "ClientRect | DOMRect"
+    },
+    {
+        "kind": "method",
+        "interface": "Range",
+        "name": "getBoundingClientRect",
+        "signatures": [
+            "getBoundingClientRect(): ClientRect | DOMRect"
+        ]        
+    },
     {
         "kind": "property",
         "interface": "RequestInit",
@@ -1708,6 +1751,14 @@
             "fill(path: Path2D, fillRule?: CanvasFillRule): void"
         ]
     },
+    {
+        "kind": "method",
+        "interface": "Range",
+        "name": "getClientRects",
+        "signatures": [
+            "getClientRects(): ClientRectList | DOMRectList"
+        ]
+    },
     {
         "kind": "method",
         "interface": "CanvasRenderingContext2D",