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length (attribute )

Owning interface and usage:  
NodeList.length

Member of these other interfaces:  
none

Readonly:   yes

Type:   unsigned

Description:  
The number of nodes in the list. The range of valid child node indices is 0 to length-1 inclusive.


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 collection = main.getElementsByTagName('DIV');
  var output = collection.length;
Output:
desired your browser
5