This seems pretty obvious to me. And at the same time, entirely not a problem. A great example that comes to mind is the drm component that Netflix require to

This seems pretty obvious to me. And at the same time, entirely not a problem. A great example that comes to mind is the drm component that Netflix require to deliver html5 instead of that spotlight .. thing. I cannot think of any other site that has needed it - or at least, any other site I visited before it was available, that suffered for it. And still, I consider it a requirement. That feature that I require for exactly one site.