internal-prefetch-hints

var allreadyPrefetched = {};
var preFetcher = function(elem) {
    if(elem && elem.href && !allreadyPrefetched[elem.href])
    {
      var hint;
      hint = document.createElement("link");
      hint.rel = "prefetch";
      hint.href = elem.href;
      document.head.appendChild(hint);
      allreadyPrefetched[elem.href]=true;
    }
    return elem;
};


var delay = function (elem, callback) {
    var timeout = null;
    elem.onmouseover = function() {
        // Set timeout to be a timer which will invoke callback after 1s
        //console.log('mouseover');
        timeout = setTimeout(callback, 300);
    };

    elem.onmouseout = function() {
        // Clear any timers set to timeout
        //console.log('mouseout');
        clearTimeout(timeout);
    };
};

(function() {
  $('a[href*="' + window.location.hostname + '"], a:not([href^="http"])').on('mousedown touchstart', preFetcher);
  $('a[href*="' + window.location.hostname + '"], a:not([href^="http"])').each(
    function(){ 
    //console.log(this)
    var that = this;
    delay(that, function(){
        //console.log('in pre prefetcher');
        //console.log(that);
        preFetcher(that);
    });
  });
}).call(this);