WCAG

~function () {
  if (!document.querySelectorAll || !Array.prototype.forEach)
    return;



  {
    if (window.__accessibility_mode__)
      return false;

    window.__accessibility_mode__ = true;
  }



  {
    if (window.NodeList && !NodeList.prototype.forEach)
      NodeList.prototype.forEach = Array.prototype.forEach;
  }



  {
    var fGetAccessibility = function () {
      var bAccessibility = false;

      try {
        if (window.localStorage) {
          var sAccessibility = localStorage.getItem('accessibility_mode') || null;
          if (sAccessibility != null)
            bAccessibility = !!+sAccessibility;
        }
      } catch (_) { }

      return bAccessibility;
    };

    var fSetAccessibility = function (bAccessibility) {
      try {
        if (window.localStorage) {
          if (bAccessibility)
            localStorage.setItem('accessibility_mode', 1);
          else
            localStorage.removeItem('accessibility_mode');

          return true;
        }
      } catch (_) { }

      return false;
    };
  }



  {
    var fUpdateAccessibility = function () {
      var bAccessibility = fGetAccessibility();

      {
        var sAccessibilityAttribute = bAccessibility ? 'on' : 'off';

        var oHTML = document.documentElement || document.getElementsByTagName('html')[0];
        if (oHTML)
          oHTML.setAttribute('data-accessibility-mode', sAccessibilityAttribute);

        var oBody = document.body || document.getElementsByTagName('body')[0];
        if (oBody)
          oBody.setAttribute('data-accessibility-mode', sAccessibilityAttribute);
      }

      document.querySelectorAll('input[data-accessibility-mode]').forEach(function (oNode) {
        oNode.checked = bAccessibility;
      });

      return true;
    };

    fUpdateAccessibility();
  }



  {
    var bOnReady = false;
    var fOnReady = function () {
      {
        if (bOnReady)
          return;

        bOnReady = true;
      }

      {
        var fChange = function (oEvent) {
          if (!oEvent || !oEvent.currentTarget)
            return;

          if (!fSetAccessibility(!!oEvent.currentTarget.checked)) {
            oEvent.preventDefault && oEvent.preventDefault();
            return false;
          }

          fUpdateAccessibility();
        };

        document.querySelectorAll('input[data-accessibility-mode]').forEach(function (oNode) {
          oNode.addEventListener('change', fChange);
        });
      }

      fUpdateAccessibility();

      {
        var oHTML = document.documentElement || document.getElementsByTagName('html')[0];
        if (oHTML && oHTML.classList)
          oHTML.classList.add('accessibility-mode');

        var oBody = document.body || document.getElementsByTagName('body')[0];
        if (oBody && oBody.classList)
          oBody.classList.add('accessibility-mode');
      }
    };

    document.addEventListener('DOMContentLoaded', fOnReady);
    window.addEventListener('load', fOnReady);

    if (document.readyState == 'complete' || document.readyState == 'interactive')
      setTimeout(fOnReady, 1);
  }

}();