Wrapper for adding/removing multiple classes with classList API. Browsers do not identify multiple class names the same way (space delimited or arguments-based)

classList-multipleClasses.js

// Usage:
// el.classList.addMany('so', 'simple');
// el.classList.removeMany('inconsistencies', 'please')

['add', 'remove'].forEach(function(action) {
  DOMTokenList.prototype[action + 'Many'] = function() {
    for (var i = arguments.length - 1; i >= 0; i--) {
      this[action](arguments[i]);
    };
  }  
});