supported.js

//= require "domready"

(function () {
  domready(function () {
    var bns;
    var supported = (function () {
      var checks = [];

      try {
        if (!Object.keys || !Array.prototype.map) {
          return false;
        }

        checks = Object.keys(Modernizr).map(function (check) {
          return !!Modernizr[check];
        });

        return !~checks.indexOf(false);
      } catch(e) {
        return false;
      }
    })();

    if (!supported) {
      bns = document.getElementById('browser-not-supported');
      bns.className = bns.className + ' show';
    }

    window.BROWSER_SUPPORTED = supported;
  });
})();