welsonjs/node_modules/modernizr/feature-detects/cookies.js

/*!
{
  "name": "Cookies",
  "property": "cookies",
  "tags": ["storage"],
  "authors": ["tauren"]
}
!*/
/* DOC
Detects whether cookie support is enabled.
*/
define(['Modernizr'], function(Modernizr) {
  // https://github.com/Modernizr/Modernizr/issues/191

  Modernizr.addTest('cookies', function() {
    // navigator.cookieEnabled cannot detect custom or nuanced cookie blocking
    // configurations. For example, when blocking cookies via the Advanced
    // Privacy Settings in IE9, it always returns true. And there have been
    // issues in the past with site-specific exceptions.
    // Don't rely on it.

    // try..catch because some in situations `document.cookie` is exposed but throws a
    // SecurityError if you try to access it; e.g. documents created from data URIs
    // or in sandboxed iframes (depending on flags/context)
    try {
      // Create cookie
      document.cookie = 'cookietest=1';
      var ret = document.cookie.indexOf('cookietest=') !== -1;
      // Delete cookie
      document.cookie = 'cookietest=1; expires=Thu, 01-Jan-1970 00:00:01 GMT';
      return ret;
    }
    catch (e) {
      return false;
    }
  });
});