microsoft · jakebailey · Oct 18, 2025 · Oct 18, 2025
diff --git a/baselines/dom.generated.d.ts b/baselines/dom.generated.d.ts
@@ -32814,6 +32814,12 @@ interface ToggleEvent extends Event {
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/oldState)
      */
     readonly oldState: string;
+    /**
+     * The **`source`** read-only property of the ToggleEvent interface is an Element object instance representing the HTML popover control element that initiated the toggle.
+     *
+     * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/source)
+     */
+    readonly source: Element | null;
 }
 
 declare var ToggleEvent: {

diff --git a/baselines/ts5.5/dom.generated.d.ts b/baselines/ts5.5/dom.generated.d.ts
@@ -32788,6 +32788,12 @@ interface ToggleEvent extends Event {
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/oldState)
      */
     readonly oldState: string;
+    /**
+     * The **`source`** read-only property of the ToggleEvent interface is an Element object instance representing the HTML popover control element that initiated the toggle.
+     *
+     * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/source)
+     */
+    readonly source: Element | null;
 }
 
 declare var ToggleEvent: {

diff --git a/baselines/ts5.6/dom.generated.d.ts b/baselines/ts5.6/dom.generated.d.ts
@@ -32811,6 +32811,12 @@ interface ToggleEvent extends Event {
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/oldState)
      */
     readonly oldState: string;
+    /**
+     * The **`source`** read-only property of the ToggleEvent interface is an Element object instance representing the HTML popover control element that initiated the toggle.
+     *
+     * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/source)
+     */
+    readonly source: Element | null;
 }
 
 declare var ToggleEvent: {

diff --git a/baselines/ts5.9/dom.generated.d.ts b/baselines/ts5.9/dom.generated.d.ts
@@ -32811,6 +32811,12 @@ interface ToggleEvent extends Event {
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/oldState)
      */
     readonly oldState: string;
+    /**
+     * The **`source`** read-only property of the ToggleEvent interface is an Element object instance representing the HTML popover control element that initiated the toggle.
+     *
+     * [MDN Reference](https://developer.mozilla.org/docs/Web/API/ToggleEvent/source)
+     */
+    readonly source: Element | null;
 }
 
 declare var ToggleEvent: {

diff --git a/inputfiles/mdn b/inputfiles/mdn
diff --git a/package-lock.json b/package-lock.json
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