Does an HTML element absolutely positioned outside of the viewport area affect the performance of re


For example, if I have a <div> with style:

position: absolute; width: 100px; height: 100px; left: -10000px; top: -10000px;

When a repaint of the viewport happen, there is some time loss due to the div's presence in DOM?

NOTE: the <div> has visibility: visible and display: block


Simple answer - yes.

Even though you can't see it, it still has to be rendered into the DOM as you say.

People do this a lot then do some fancy animation to bring it into view. The thing to ask is is there a difference between rendering the whole DOM in one hit or would you save time by rendering each bit, when requested with AJAX ?

It depends on the complexitity of the content in your 'hidden' section(s)...

Edit: Try using Fiddler : <a href="http://www.telerik.com/fiddler" rel="nofollow">http://www.telerik.com/fiddler</a> : this will allow you to see what is taking time to load on your pages...


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