Simplify Page Visibility API (mdn#20286)

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

@@ -128,11 +128,6 @@ The Page Visibility API adds the following properties to the {{domxref("Document
       - : The page content may be at least partially visible. In practice this means that the page is the foreground tab of a non-minimized window.
     - `hidden`
       - : The page's content is not visible to the user, either due to the document's tab being in the background or part of a window that is minimized, or because the device's screen is off.
-    - `prerender`
-
-      - : The page's content is being prerendered and is not visible to the user. A document may start in the `prerender` state, but will never switch to this state from any other state, since a document can only prerender once.
-
-        > **Note:** Not all browsers support prerendering.
 
 ## Events added to the Document interface