I guess you're thinking of Pivot here, which uses Deep Zoom for display, but off...

ygra on Oct 3, 2014 | parent | context | favorite | on: The tourist map of laptops

I guess you're thinking of Pivot here, which uses Deep Zoom for display, but offers facets for filtering. I just noticed that there seems to be a JavaScript implementation too: https://github.com/seajax/seajax/blob/master/v2/app/pivot/qu...