add

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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