Add page for Navigation.activation (#36442)

* Add page for `Navigation.activation`

* Update files/en-us/web/api/navigation/activation/index.md

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* update

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

files/en-us/web/api/navigation/activation/index.md

@@ -0,0 +1,39 @@
+---
+title: "Navigation: activation property"
+short-title: activation
+slug: Web/API/Navigation/activation
+page-type: web-api-instance-property
+status:
+  - experimental
+browser-compat: api.Navigation.activation
+---
+
+{{APIRef("Navigation API")}}{{SeeCompatTable}}
+
+The **`activation`** read-only property of the {{domxref("Navigation")}} interface returns a {{domxref("NavigationActivation")}} object containing information about the most recent cross-document navigation, which "activated" this Document. The property will stay constant during same-document navigations.
+
+## Value
+
+A {{domxref("NavigationActivation")}} object, or `null` if current document is the initial `about:blank` document.
+
+## Examples
+
+```js
+if (navigation.activation) {
+  console.log(navigation.activation.entry.url);
+}
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- [Modern client-side routing: the Navigation API](https://developer.chrome.com/docs/web-platform/navigation-api/)
+- [Navigation API explainer](https://github.com/WICG/navigation-api/blob/main/README.md)
+- Domenic Denicola's [Navigation API live demo](https://gigantic-honored-octagon.glitch.me/)

files/en-us/web/api/navigation/index.md

@@ -21,6 +21,8 @@ The Navigation API only exposes history entries created in the current browsing
 
 _Inherits properties from its parent, {{DOMxRef("EventTarget")}}._
 
+- {{domxref("Navigation.activation", "activation")}} {{ReadOnlyInline}} {{Experimental_Inline}}
+  - : Returns a {{domxref("NavigationActivation")}} object containing information about the most recent cross-document navigation, which "activated" this Document.
 - {{domxref("Navigation.canGoBack", "canGoBack")}} {{ReadOnlyInline}} {{Experimental_Inline}}
   - : Returns `true` if it is possible to navigate backwards in the navigation history
     (i.e. the {{domxref("Navigation.currentEntry", "currentEntry")}} is not the first one in the history entry list),
@@ -58,6 +60,8 @@ _Inherits methods from its parent, {{DOMxRef("EventTarget")}}._
 
 ## Events
 
+_Inherits events from its parent, {{DOMxRef("EventTarget")}}._
+
 - {{domxref("Navigation/currententrychange_event", "currententrychange")}} {{Experimental_Inline}}
   - : Fired when the {{domxref("Navigation.currentEntry")}} has changed.
 - {{domxref("Navigation/navigate_event", "navigate")}} {{Experimental_Inline}}

files/en-us/web/api/navigation_api/index.md

@@ -94,7 +94,7 @@ There are a few perceived limitations with the Navigation API:
   - : Event object for the {{domxref("Navigation/navigate_event", "navigate")}} event, which fires when [any type of navigation](https://github.com/WICG/navigation-api#appendix-types-of-navigations) is initiated. It provides access to information about that navigation, and most notably the {{domxref("NavigateEvent.intercept", "intercept()")}}, which allows you to control what happens when the navigation is initiated.
 - {{domxref("Navigation")}} {{Experimental_Inline}}
   - : Allows control over all navigation actions for the current `window` in one central place, including initiating navigations programmatically, examining navigation history entries, and managing navigations as they happen.
-- {{domxref("NavigationActivation")}}
+- {{domxref("NavigationActivation")}} {{Experimental_Inline}}
   - : Represents a recent cross-document navigation. It contains the navigation type and current and destination document history entries.
 - {{domxref("NavigationCurrentEntryChangeEvent")}} {{Experimental_Inline}}
   - : Event object for the {{domxref("Navigation/currententrychange_event", "currententrychange")}} event, which fires when the {{domxref("Navigation.currentEntry")}} has changed. It provides access to the navigation type, and the previous history entry that was navigated from.