webp.js

/**
 * WebP support check
 *
 * The cookie will be set for the top level domain, e.g. ".zanui.com.au".
 * This will enable access from "static.zanui.com.au".
 *
 * Script might not work for local environments.
 *
 * @author <a href="mailto:[email protected]">Enrico Stahn</a>
 */
;(function ($, window, undefined) {
  'use strict';

  if ($.cookie('__webp') !== undefined) {
    return;
  }

  var domain = window.document.location.hostname.replace(/www\./, '');
  var cookieOptions = { expires: 365, path: '/', domain: '.' + domain };

  var image = new window.Image();

  image.onload = function () {
    if (!!(image.height > 0 && image.width > 0)) {
      $.cookie('__webp', 1, cookieOptions);
    }
  };

  image.onerror = function () {
    $.cookie('__webp', 0, cookieOptions);
  };

  image.src = 'data:image/webp;base64,UklGRjoAAABXRUJQVlA4IC4AAACyAgCdASoCAAIALmk0mk0iIiIiIgBoSygABc6WWgAA/veff/0PP8bA//LwYAAA';

})(jQuery, window);