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    <p>You've got quite a bit of confusion here.</p> <blockquote> <p><strong>1.</strong> <em>Which is faster, parseInt(el.style.width) or el.offsetWidth?</em></p> </blockquote> <ul> <li><p><code>el.style.width</code> gives you the width set by javascript or style attribute in the markup. </p></li> <li><p><code>offsetWidth</code> gives you the current width of the element (including borders).</p></li> </ul> <blockquote> <p><strong>2.</strong> <em>Should I write <code>parseInt(el.offsetWidth)</code>?</em></p> </blockquote> <p>No, <code>offsetWidth</code> returns a number. But you should specify the radix whenever you use <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/parseInt" rel="nofollow"><code>parseInt</code></a>!</p> <blockquote> <p><strong>3.</strong> <em>Which is faster, <code>getElementById()</code> or <code>childNodes[]?</code></em></p> </blockquote> <p>If you got the parent use the <code>childNodes</code>. If you got the id, you can use byId. Performance will depend on the browser (<a href="http://jsperf.com/childnodes-getbyid" rel="nofollow">test</a>).</p> <blockquote> <p><strong>4.</strong> <em>Which is faster, <code>new Image()</code> or <code>appendChild('img')</code>?</em></p> </blockquote> <p>If you want to force the browser to download a resource, use <code>new Image()</code>. If you want to add an image to the layout use <code>appendChild(IMAGE_ELEMENT)</code></p> <blockquote> <p><strong>5.</strong> <em>Give me please a link to a splendid Javascript PERFORMANCE guide</em></p> </blockquote> <p>I rather leave you with this link: <a href="http://jsperf.com/" rel="nofollow">http://jsperf.com/</a>, and let you do A/B testing. </p>
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    1. COA/B/C/D/E... testing?
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    2. CO@Hello71 - A/B testing is an experiment approach for making marketing decisions, when there are two alternatives and a single variable. In this context it refers to the methodology of deciding between two pieces of code in terms of performance.
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    3. CONice answer +1. Interesting about IE and `...ById()`. Do you happen to know if it is actually traversing the DOM to get find the element? I'd be curious about its performance on a complex HTML structure. I've just always assumed it would be quick. I'll probably do some testing later on.
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