/// <summary>
/// Asserts that the element is enabled.
/// </summary>
/// <param name="handle">An <see cref="ElementHandle"/></param>
/// <param name="message">Optional failure message</param>
/// <remarks><![CDATA[Elements: <button>, <command>, <fieldset>, <input>, <keygen>, <optgroup>, <option>, <select>, <textarea>]]></remarks>
/// <returns>The <see cref="ElementHandle"/> for method chaining</returns>
public static ElementHandle ShouldBeEnabled(this ElementHandle handle, string message = null)
{
if (handle.IsDisabled())
{
Throw.ShouldBeEnabled(handle, message);
}
return(handle);
}