Just to add something to the discussion...
For a partner we're working with to copromote an upcoming webinar, the Marketo form 2.0 that was embedded in our Unbounce form just wouldn't load. I had him verify his javascript settings, but it still wouldn't load. I wasn't able to recreate the issue and I went through code verification with a fine toothed comb. The only thing I can think of as causing their issue is that there's a firewall setting preventing javascript from loading.
This presented an issue for me because:
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we sell into the finance industry and I can assume that, given the confidential sensitivity of data in the industry, there are likely a lot of our prospect companies that could have similar settings
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our conversion rates are lower than I would expect on click throughs from digital advertising
So I decided to try something new; I copied the page source code from the unbounce page to a Marketo landing page (using a blank, no css template) and added the Marketo form on the Marketo landing page, since then javascript wouldn't be an issue.
It seems to have worked fine. The page will still detect if it's being accessed from a mobile device and then redirect to the mobile Unbounce page we created.
This likely won't be an issue for the majority of Unbounce/Marketo users (<0.02% browsers in the US have javascript disabled), but I couldn't risk this cross-promotion being a flop because of javascript/firewall issues.