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SharePoint 2010: CssRegistration ConditionalExpression Property

In a previous post detailing the new SharePoint 2010 CssRegistration control, I mentioned that I did not know what the ConditionalExpression property did. Well, now I do!

This property takes an Internet Explorer Conditional Comment. For example, if we wanted to link to a style sheet specific to IE 7 or greater, we can do this:

<SharePoint:CSSRegistration Name="foo.css" ConditionalExpression="gte IE 7" runat="server" />

The following markup would be emitted:

<!--[if gte IE 7]>
<link rel="stylesheet" type="text/css" href="foo.css"/>
<![endif]-->
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