JAVASCRIPT isDescendantOrSelf.js
'use strict';
function isDescendantOrSelf(potentialDescendant, potentialAncestor) {
let el = potentialDescendant;
do {
if (el === potentialAncestor) {
return true;
}
el = el.parentElement;
}while (el)
return false;
}
exports.isDescendantOrSelf = isDescendantOrSelf;