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ShadowRoot: fullscreenElement property - Web APIs | MDN
ShadowRoot: fullscreenElement property Limited availability
The fullscreenElementShadowRoot
The Elementnull if there is no full screen element.
let customElem = document.querySelector("my-shadow-dom-element");
let shadow = customElem.shadowRoot;
let fullscreenElem = shadow.fullscreenElement;
