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ShadowRoot: fullscreenElement property - Web APIs | MDN
ShadowRoot: fullscreenElement property Limited availability
The fullscreenElement
read-only property of the
ShadowRoot
interface returns the element within the shadow tree that is currently displayed in full screen.
The Element
which is currently is displayed in full screen mode,
or null
if there is no full screen element.
let customElem = document.querySelector("my-shadow-dom-element");
let shadow = customElem.shadowRoot;
let fullscreenElem = shadow.fullscreenElement;