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createAttribute (method )

Owning interface and usage:  
Document.createAttribute(name)

Member of these other interfaces:  
none

Description:  
Creates an Attr of the given name. Note that the Attr instance can then be set on an Element using the setAttribute() method.

Parameters:  
DOMString name  -  The name of the attribute.

Returns:  
Attr -  A new Attr object with the nodeName attribute set to name, and localName, prefix, and namespaceURI set to null. The value of the attribute is the empty string.

Exceptions:  
DOMException INVALID_CHARACTER_ERR
Raised if the specified name contains an illegal character.


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 attr = document.createAttribute('temp');
  attr.value = 'temporary';
  main.setAttributeNode(attr);
  var output = main.getAttribute('temp');
Output:
desired your browser
temporary