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POWhat optimizations does a browser perform when a DOM element is being rendered off screen?
 

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  1. POWhat optimizations does a browser perform when a DOM element is being rendered off screen?
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    <p>I control an iframe being rendered on another domain. Is there a clear way of telling whether this iframe is being rendered above or below the fold on the parent page? Obviously, I can't access the parent DOM because of the <a href="http://en.wikipedia.org/wiki/Same_origin_policy" rel="noreferrer">same origin policy</a> restriction.</p> <p>For example, I tried measuring the speed of rendering on a <code>canvas</code> or <code>VML</code> tag, hoping it would be faster when the tag isn't on screen. This didn't work - there was no discernable speed difference. Ditto for DOM manipulation - there doesn't seem to be a way to differentiate between reflow/repaint operations below or above the fold.</p> <p>What about flash? I don't have much experience, but could one check how quickly a browser renders flash operations? Or does flash have any 'onvisible' events outside of the DOM standard?</p>
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    1. USAndrey Fedorov
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    1. COWill you be needing this for production use? Can you elaborate a bit on the background?
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    2. COSure. This is part of is an ad-serving system, and I'd like to run a test to see the % of the time an ad is visible to users, to obtain a more accurate sense of their value. This will run in production very shortly, and for a limited number of ads served, so performance isn't very important. Of course, it shouldn't break the page (or iframe) or detract from the user experience in any way.
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      1. POWhat optimizations does a browser perform when a DOM element is being rendered off screen?
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    3. COHow is the ad served exactly, is a Javascript snippet involved?
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