Also no content shows up at all without allowing Javascript (ie Noscript). This will absolutely kill SEO, even SEO that interprets Javascript (ie Google) -- Goo

Also no content shows up at all without allowing Javascript (ie Noscript). This will absolutely kill SEO, even SEO that interprets Javascript (ie Google) -- Google can't tell if you're hiding content from search engines on purpose or not, so it's a huge, huge red flag if they can even read it.