Preparation code

<section>
<div><div><div><div><div id="end"><div><div><div><div><div><div><div><div>
<article>
<p>
<span id="start"></span>
</p>
</article>
</div></div></div></div></div></div></div></div></div></div></div></div></div>
</section>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>

 
<script>
  Benchmark.prototype.setup = function() {
    var startJQ = $( '#start' ),
        startDOM = $( '#start' )[0];
    
    Element.prototype.closestById = function( id )
    {
       
        if( this.parentNode.nodeType == Node.ELEMENT_NODE )
        {        
            
            return this.getAttribute( 'id' ) == id 
                ? this 
                : this.parentNode.closestById( id );
            
        };
        
    };
  };
</script>

Preparation code output

Test runner

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var jq1 = startJQ.closest( '#end' ),
    jq2 = startJQ.closest( '#not-found' );
 

var dom1 = startDOM.closestById( 'end' ),
    dom2 = startDOM.closestById( 'not-found' );
 

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by ThinkingStiff on 23rd October 2011
• Revision 3: published by ThinkingStiff on 24th November 2011

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