index.md

---

title: dom
slug: Mozilla/Add-ons/WebExtensions/API/dom
tags:
  - API
  - Add-ons
  - DOM
  - Extensions
  - WebExtensions
browser-compat: webextensions.api.dom

---

{{AddonSidebar}}

Access special extension only DOM features.

Functions

• {{WebExtAPIRef("dom.openOrClosedShadowRoot()")}}

  • : Gets the open shadow root or the closed shadow root hosted by the specified element. If the shadow root isn't attached to the element, it will return null.

{{WebExtExamples("h2")}}

Browser compatibility

{{Compat}}