[glimcat]

The page is basically blank if JavaScript isn't available. Turning it on shows that it is only being used to populate the main content pane.

This is a bad design decision since (a) not everyone with JavaScript off will bother to enable it if they haven't already seen something interesting, (b) not everyone with JavaScript off can enable it, and (c) you're giving yourself this problem in exchange for no apparent benefit.

Your main pitch should always, always, always be visible in the broadest compatibility case - even if that means falling back on a static mockup.