13.6.2.7 Attr Objects 
Attr inherits from Node, so inherits all its
attributes.
- name
 - 
The attribute name.  In a namespace-using document it may have colons
in it.
 
- localName
 - 
The part of the name following the colon if there is one, else the
entire name.  This is a read-only attribute.
 
- prefix
 - 
The part of the name preceding the colon if there is one, else the
empty string.
 
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