On Thu, Feb 15, 2018 at 06:13:29AM -0500, Karl Dahlke wrote:
> Well that was a few hours of painful stepping through horribly cryptic 
> javascript.
> As you recall, www.stackoverflow.com referenced
> https://js-sec.indexww.com/ht/p/185901-159836282584097.js
> which in turn ran forever, and even ran forever on its own, outside the 
> context of stackoverflow.com.
> That's good I guess, it means I only had one file to slog through.
> 
> The problem was frameElement, which we never implemented. I didn't even know 
> about it. (This is where the acid tests might help.)
> Only took 17 lines, and there it is, and the loop goes away.
> That's the thing though, js assumes our browser is perfect, and if it's not, 
> there's no guarantee that js won't go off into an infinite loop.
> It usually doesn't, but it could.

Great, thanks for sorting this.
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