Creates a new ElementExtension object.
Syntax
expression.Add(ElementID, FailIfThere)
expression An expression that returns an ElementExtensions collection.
ElementID Required String. Specifies the ID tag of an HTML element that will be extended by the new ElementExtension object.
FailIfThere Optional Boolean. If this argument is set to True and the object specified by ElementID already has an element extension, the Add method fails. If this argument is set to False (or not specified), the existing element extension is replaced.