diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
index 2fcf7559f..8b70efe11 100644
--- a/baselines/dom.generated.d.ts
+++ b/baselines/dom.generated.d.ts
@@ -207,6 +207,7 @@ interface IDBObjectStoreParameters {
 }
 
 interface IntersectionObserverEntryInit {
+    isIntersecting: boolean;
     boundingClientRect?: DOMRectInit;
     intersectionRect?: DOMRectInit;
     rootBounds?: DOMRectInit;
@@ -7211,6 +7212,7 @@ interface IntersectionObserverEntry {
     readonly rootBounds: ClientRect;
     readonly target: Element;
     readonly time: number;
+    readonly isIntersecting: boolean;
 }
 
 declare var IntersectionObserverEntry: {
diff --git a/inputfiles/addedTypes.json b/inputfiles/addedTypes.json
index 9949f42b9..d164f4a76 100644
--- a/inputfiles/addedTypes.json
+++ b/inputfiles/addedTypes.json
@@ -1630,6 +1630,19 @@
         "flavor": "Web",
         "type": "\"beforebegin\" | \"afterbegin\" | \"beforeend\" | \"afterend\""
     },
+    {
+        "kind": "property",
+        "interface": "IntersectionObserverEntryInit",
+        "name": "isIntersecting",
+        "type": "boolean"
+    },
+    {
+        "kind": "property",
+        "interface": "IntersectionObserverEntry",
+        "name": "isIntersecting",
+        "type": "boolean",
+        "readonly": true
+    },
     {
         "kind": "property",
         "interface": "ValidityState",