bookmarklet-show-anchors-links.js

(function(){
  var anchors = document.body.querySelectorAll('[id], [name]');
  Array.prototype.forEach.call(anchors, function (element) {
    var link = document.createElement('a');
    var hash = '#' + element.id || element.name;
    link.href = hash;
    link.innerText = hash;
    link.style.cssText = 'background:hotpink !important; color:#fff !important;';
    element.insertBefore(link, element.firstChild);
  });
}());