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# Prototype down() Method

This method returns element's first descendant or the n-th descendant if index is specified that matches cssRule.

If no cssRule is provided, all descendants are considered. If no descendant matches these criteria, undefined is returned.

## Syntax:

    element.down([cssRule][, index = 0]);

## Return Value:

- Found HTMLElement.
- undefined in case it does not find any element.

NOTE: element.down() and element.down(0) are equivalent.

## Example:

    <html>
    <head>
    <title>Prototype examples</title>
    <script type="text/javascript"
       src="/javascript/prototype.js">
    </script>
    <script>

    function showResult(){
       alert( "1 : " + $('fruits').down(3).innerHTML );
       alert( "2 : " + $('apples').down('li').innerHTML );
       alert( "3 : " + $('apples').down('li.yummy').innerHTML );
       alert( "4 : " + $('fruits').down('.yummy', 1).innerHTML );
       alert( "5 : " + $('fruits').down(99) );
    }

    </script>
    </head>

    <body>

       <p>Click the button to see the result.</p>

       <ul id="fruits">
       <li id="apples">
        <ul>
          <li id="golden-delicious">Golden Delicious</li>
          <li id="mutsu" class="yummy">Mutsu</li>
          <li id="mcintosh" class="yummy">McIntosh</li>
          <li id="ida-red">Ida Red</li>
        </ul>
       </li>
       </ul>

       <br />
       <input type="button" value="showResult"
                 onclick="showResult();"/>

    </body>
    </html>

To understand it in better way you can Try it yourself.

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