I'm incorporating ClientDependency into the front end of my Umbraco site for CSS/JS speed optimization purposes.

I've installed the latest version of CD, which allows HTML attributes to be rendered. However I am stuck on the syntax of the attribute and can't find any information on it anywhere.

This works:

<CD:CssInclude ID="CssInclude3" runat="server" FilePath="Print.css" PathNameAlias="Styles" HtmlAttributesAsString="media:print" />

This breaks:

<CD:CssInclude ID="CssInclude3" runat="server" FilePath="Print.css" PathNameAlias="Styles" HtmlAttributesAsString="media:screen, projection" />

It's clearly to do with the comma and space, which aren't parsed correctly, but I can't find any info on how to escape them correctly.

Any ideas appreciated!