title: how to check if charCodeAt() is configurable
body: <p><a href="https://stackoverflow.com/questions/6262132/why-ie-developer-tools-seems-to-be-more-descriptive-than-firebug-in-this-example">Here</a> it is described how to check if <code>innerHTML</code> property is configurable and enumerable using Firebug/FF Web Console.
  How can I check the same for <code>charCodeAt</code> function? <code>Object.getOwnPropertyDescriptor(HTMLElement.prototype,"charCodeAt")</code>
  return <code>undefined</code>. </p>