HTML / Conditional Comments - Do conditional comments behave as expected across browsers?

Posted by John Himmelman on Stack Overflow See other posts from Stack Overflow or by John Himmelman
Published on 2010-06-08T18:43:36Z Indexed on 2010/06/08 18:52 UTC
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Do conditional comments behave as expected across browsers? Can they cause rendering bugs or other issues?

Are there any errors in the formatting/syntax of this CC?

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="718" height="227" id="swf">
    <param name="movie" value="images/swf.swf" />
    <!--[if !IE]>-->
    <object type="application/x-shockwave-flash" data="images/swf.swf" width="718" height="227">
    <!--<![endif]-->
        <img src="images/alt.jpg" border="0" width="718" height="227">
    <!--[if !IE]>-->
    </object>
    <!--<![endif]-->
</object>

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