Calling with data- attribute partial html files

_partials.js

/* Author: cagcak
 * Requirement: jQuery >= 1.x
 * Usage : place html partial, call as partialBoneCaller(int level) in main html with 
 *         data-include='./partials/nav.html'
*/
function partialBoneCaller (level) {
  'use strict'
  var includes = $('[data-include]')
  var x = '../'
  jQuery.each(includes, function () {
    if (detectBrowser() === 'ie' ) {
      var file = repeatPollyfill(x, level) + 'views/' + $(this).data('include') + '.html'
    } else {
     var file = x.repeat(level) + 'views/' + $(this).data('include') + '.html'
    }
    $(this).load(file)
  })
}

function detectBrowser() {
    var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    var isFirefox = typeof InstallTrigger !== 'undefined';
    var isSafari = /constructor/i.test(window.HTMLElement) || (function (p) { return p.toString() === "[object SafariRemoteNotification]"; })(!window['safari'] || safari.pushNotification);
    var isIE = /*@cc_on!@*/false || !!document.documentMode;
    var isEdge = !isIE && !!window.StyleMedia;
    var isChrome = !!window.chrome && !!window.chrome.webstore;
    var isBlink = (isChrome || isOpera) && !!window.CSS;
    if (isOpera){return 'opera'} else if (isFirefox){ return 'firefox'} else if (isSafari) { return 'safari' } else if (isIE) { return 'ie'; } else if (isEdge) { return 'edge'; } else if (isChrome) { return 'chrome' } else if (isBlink) { return 'blink' }
}

function repeatPollyfill(deep, times) {
  if (times <= 0) { return '' } else if (times === 1) { return deep } else {
    return deep + repeatPollyfill(deep, times - 1)
  }
}