My guess is that it only requests data that it can statically parse (e.g. HTML attributes and tags) and archives that. Anything more complex would require using

My guess is that it only requests data that it can statically parse (e.g. HTML attributes and tags) and archives that. Anything more complex would require using an actual browser (either via Webdriver, a custom build, or a pile of hacks that implement something identical to one); and would have problems with adversarial content and so on. I say this because I know that Wayback Machine didn't archive multi-load Flash files. That would require parsing SWFs and executing their embedded Action/ABC tags, which requires writing something equivalent to Flash Player. SPAs aren't much different in terms of archivability as all-Flash websites were.