URL for CSS-file.
If this path starts with a slash, then the webapp context path will be prepended to it.
This makes it simple to reference stylesheets at an absolute path within the webapp.
A value like "/styles/style.css" becomes "/webappname/styles/style.css".
If this path does not start with a slash, then it is output unaltered. This supports
absolute urls ("http://host/path/style.css"). It also supports having css files relative
to the current page ("style.css" or "styles/style.css") but this needs to be used with
care as the standard JSF postback/internal-forward navigation style can cause browsers
to use an inappropriate base url when resolving relative references.
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