javascript - What optimizations does a browser perform when a DOM element is being rendered off screen? -

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I control the iframe provided on another domain. Is there a clear way to tell if this iframe is being shown above or below the parent page? Obviously, I can not reach the Parent Dome due to the ban.

For example, I tried to measure the speed of rendering at canvas or VML tag, hopefully it will be faster when the tag screen But will not. It was not working - there was no difference in the speed. Dome manipulation - there is not a way to differentiate between reflow / repaint operation at the bottom or above the fold.

What about Flash? I do not have much experience, but can one see how a browser runs the flash operation fast? Or is there a 'sight' event outside the 'dome standard' or flop?

I do not think so.

Stops the same basic policy restriction, although you can use the URL parameter, which can be set by javascript when embedding the ad on the page offset.


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