Duffer Derek

/* eslint-disable no-bitwise, no-cond-assign */

/**
 * Checks if an element contains another given element.
 * 
 * @param context the context element
 * @param node the element to check
 */
export default function contains(context, node) {
  // HTML DOM and SVG DOM may have different support levels,
  // so we need to check on context instead of a document root element.
  if (context.contains) return context.contains(node);
  if (context.compareDocumentPosition) return context === node || !!(context.compareDocumentPosition(node) & 16);
}