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getAttributeNode (method )

Owning interface and usage:  
Element.getAttributeNode(name)

Member of these other interfaces:  
none

Description:  
Retrieves an attribute node by name.

Parameters:  
DOMString name  -  The name (nodeName) of the attribute to retrieve.

Returns:  
Attr -  The Attr node with the specified name (nodeName) or null if there is no such attribute.

Exceptions:  
none


Example:
Text in the first DIV.
Some text in the second DIV.
Some text and element in the third DIV.
We can try another elements. It will be much more interesting.
Text in the last DIV.
Source: 
   <div id="doc">
     <div>
       Text in the first DIV.
     </div>
     <div id="DDD" class="secondClass">
       Some text in the second DIV.
     </div>
     <div class="thirdClass">
       Some text and <span id="SSS">element</span> in the third DIV.
     </div>
     <div class="fourthClass">
       We can try <i>another elements</i>.
       It will be much more <b>interesting</b>.
     </div>
     <div>
       Text in the last DIV.
     </div>
   </div>
JavaScript: 
  var main = document.getElementById('doc');
  var output = main.getAttributeNode('id').value;
Output:
desired your browser
doc