mdn-polyfills/Element.prototype.closest.js

MDN polyfills

Element.prototype.matches||(Element.prototype.matches=Element.prototype.msMatchesSelector||Element.prototype.webkitMatchesSelector),window.Element&&!Element.prototype.closest&&(Element.prototype.closest=function(e){var t=this;do{if(t.matches(e))return t;t=t.parentElement||t.parentNode}while(null!==t&&1===t.nodeType);return null});