Add missing Sanitizer API (#3694)

Co-authored-by: Michael Hoffman <45407486+mikehoffms@users.noreply.github.com>

Author: captainbrosset

microsoft-edge/web-platform/release-notes/145.md

@@ -33,6 +33,7 @@ To stay up-to-date and get the latest web platform features, download a preview
   * [Overscroll effect on nested scroll containers](#overscroll-effect-on-nested-scroll-containers)
 * [Web APIs](#web-apis)
   * [Origin API](#origin-api)
+  * [Sanitizer API](#sanitizer-api)
   * [PerformanceEntry presentationTime and paintTime properties](#performanceentry-painttime-and-presentationtime-properties)
   * [Require sticky user activation or permission for clipboardchange events](#require-sticky-user-activation-or-permission-for-clipboardchange-events)
   * [onanimationcancel event handler](#onanimationcancel-event-handler)
@@ -221,6 +222,17 @@ See also:
 * [The Origin interface](https://html.spec.whatwg.org/multipage/browsers.html#the-origin-interface)
 
 
+<!-- ------------------------------ -->
+#### Sanitizer API
+
+The Sanitizer API parses and inserts HTML into the DOM in a way that can prevent cross-site scripting attacks.
+
+The Sanitizer API is useful in cases where user input sanitization is necessary, but hard to implement correctly. The API offers a high-quality sanitization process with a default behavior that can be customized if necessary, improving the security of your web application.
+
+See also:
+* [HTML Sanitizer API](https://developer.mozilla.org/docs/Web/API/HTML_Sanitizer_API) at MDN.
+
+
 <!-- ------------------------------ -->
 #### PerformanceEntry `paintTime` and `presentationTime` properties