I think it is more appropriate to use:
<link type="text/css" rel="stylesheet" href="http://yui.yahooapis.com/3.3.0/build/cssgrids/grids-min.css" />
I'm not sure, but when you use <h:graphicImage/> or <h:outputStylesheet/> , you want to keep in mind some kind of folder that is inside the resources folder, which, for example, has the name css (which will only have style sheets, of course;))
Images:
<h:graphicImage library="images" name="picuture.jpg" />
CSS
<h:outputStylesheet library="css" name="grids-min.css" target="head" />
eg:
Webcontent
resources
images
// images
css
// stylesheets
My suggestion:
<link type="text/css" rel="stylesheet" href="http://yui.yahooapis.com/3.3.0/build/cssgrids/grids-min.css" />
or you download this .css and put in your CSS folder in resources.
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