How to make URLs hypertextual?

I'm a CSL newbie using pandoc and trying to create or find a style for New Media & Society [NMS]. I'd like the resulting HTML bibliography to have "hot" URLs such that they are clickable? What do I do to <text variable="URL"/> to make it hypertextual.

[NMS]: http://newmediaandsociety.com/nmsstyle/SAGEUK-NMSstyleguide.pdf

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