/// <summary>
/// Check the current matched set of elements against an element, and return true if the element
/// is found within the selection set.
/// </summary>
///
/// <param name="element">
/// An element to match against the current selection set.
/// </param>
///
/// <returns>
/// true if it is found, false if it fails.
/// </returns>
///
/// <url>
/// http://api.jquery.com/is/
/// </url>
public bool Is(IDomObject element)
{
return(SelectionSet.Contains(element));
}