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// https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
if (!Element.prototype.matches) {
Element.prototype.matches
= Element.prototype.msMatchesSelector
|| Element.prototype.webkitMatchesSelector
}
if (!Element.prototype.closest) {
Element.prototype.closest = function(s) {
var el = this
do {
if (el.matches(s)) return el
el = el.parentElement || el.parentNode
} while (el !== null && el.nodeType === 1)
return null
}
}
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