intro.js/src/util/elementInViewport.d.ts

User Onboarding and Product Walkthrough Library

/**
 * Check to see if the element is in the viewport or not
 * http://stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport
 *
 * @api private
 */
export default function elementInViewport(el: HTMLElement): boolean;