1. Mozilla
  2. Add-ons
  3. Browser extensions
  4. JavaScript APIs
  5. dom

dom

Access special extension only DOM features.

Functions

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.

Browser compatibility

Chrome
Edge
Firefox
Opera
Safari
Firefox for Android
Safari on iOS
dom
Chrome – Full support
Chrome 88 (Release date: 2021-01-19)
footnote Full support
Edge – Full support
Edge 88 (Release date: 2021-01-21)
footnote Full support
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 74 (Release date: 2021-02-02)
footnote Full support
Safari – Full support
Safari 26 (Release date: 2025-09-15)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote No support
Safari on iOS – Full support
Safari on iOS 26 (Release date: 2025-09-15)
footnote Full support
openOrClosedShadowRoot
Chrome – Full support
Chrome 88 (Release date: 2021-01-19)
footnote Full support
Edge – Full support
Edge 88 (Release date: 2021-01-21)
footnote Full support
Firefox – No support
Firefox
footnote
footnote Use element.openOrClosedShadowRoot, available since Firefox 63.
Opera – Full support
Opera 74 (Release date: 2021-02-02)
footnote Full support
Safari – Full support
Safari 26 (Release date: 2025-09-15)
footnote Full support
Firefox for Android – No support
Firefox for Android
footnote
footnote Use element.openOrClosedShadowRoot, available since Firefox for Android 63.
Safari on iOS – Full support
Safari on iOS 26 (Release date: 2025-09-15)
footnote Full support

Tip: you can click/tap on a cell for more information.

Full support
No support
See implementation notes.

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