Visibility based on JavaScript enabled or not

[nickpagz]

What problem does this address?

While there aren't that many non-JS enabled browsers out there, it's certainly non-zero. Having the ability to show/hide blocks based on this could be helpful in some situations. Having this ability could allow site builders to provide non-JS fallback content, for example.

What is your proposed solution?

Visibility controls based on whether or not javascript is enabled on a site visitor's browser.