drift-zoom/src/js/util/dom.js

Easily add "zoom on hover" functionality to your site's images. Lightweight, no-dependency JavaScript.

// This is not really a perfect check, but works fine.
// From http://stackoverflow.com/questions/384286
const HAS_DOM_2 = typeof HTMLElement === "object";

export function isDOMElement(obj) {
  return HAS_DOM_2
    ? obj instanceof HTMLElement
    : obj && typeof obj === "object" && obj !== null && obj.nodeType === 1 && typeof obj.nodeName === "string";
}

export function addClasses(el, classNames) {
  classNames.forEach(function(className) {
    el.classList.add(className);
  });
}

export function removeClasses(el, classNames) {
  classNames.forEach(function(className) {
    el.classList.remove(className);
  });
}