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ShadowRoot: activeElement property - Web APIs | MDNShadowRoot: activeElement property
The activeElement read-only property of the
ShadowRoot interface returns the element within the shadow tree that has focus.
The Element which currently has focus, or null if there is no focused element.
let customElem = document.querySelector("my-shadow-dom-element");
let shadow = customElem.shadowRoot;
let focusedElem = shadow.activeElement;
