add(element=nil)
Instance Public methods
Adds an element
element
if supplied, is either an Element, String, or Source (see Element.initialize). If not supplied or
nil, a new, default Element will be constructed
Returns
the added Element
a = Element.new('a')
a.elements.add(Element.new('b')) #-> <a><b/></a>
a.elements.add('c') #-> <a><b/><c/></a>
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