/**
 * Sets the `attribute` of an `element` to the specified `value` _if_ the element's attribute
 * did not already have that value. Used to avoid redundantly triggering `MutationObserver`s.
 *
 * @param {HTMLElement} element
 * @param {string} attribute
 * @param {string} value
 * @returns {void}
 */
export function setAttributeFor(element: HTMLElement, attribute: string, value: string): void;
/**
 * Checks if the provided `element` contains **_either_** end of the page's current {@link Selection}.
 * This check can pass even if the page's Selection is {@link Selection.isCollapsed collapsed}.
 * Supports Shadow DOMs only where {@link Selection.getComposedRanges} is supported.
 *
 * **NOTE**: If the page's Selection resides _outside_ the provided `element` (e.g., the selection starts _before_ the
 * `element` and ends _after_ the `element`), this check will return `false` (since the selection does not
 * reside _within_ the `element`).
 * @param {HTMLElement} element
 * @returns {boolean}
 */
export function selectionIsWithin(element: HTMLElement): boolean;
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