Comment 14 for bug 371618

In case a persuasive use case for this functionality were needed, here is a UK government form that makes use of calculated fields: https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/459092/IHT205_2011_.pdf (Inheritance Tax: return of Estate Information IHT205).

I agree that the execution of JavaScript should be optional, and indeed should be turned off by default ... but alas I see there isn't any way to turn it on at present.

Interestingly, there appears to be no alternative to using Windows (or maybe OSX?) for filling in a PDF form if the calculated fields are mandatory, at least I've not found *anything* after quite a bit of searching. In my case I'll write the computed values in by hand.