Publishing on arXiv in preparation for WWW conference There's a framework I've been working on and I'm interested to release it to the open source and research community but I'd also really like to publish it at the upcoming WWW conference. 

Is it against the rules of that conference to pre-publish a paper I later submit there, or at least the crux of such a paper, on a site like arXiv?
Since the conference will make  the papers from the proceedings open access "The proceedings of WWW are published online (open access) and through ACM Digital Library, and it is considered one of the most impactful conferences in computer science." I don't think the arxiv preprint should be a problem. However, you should e-mail first to the WWW2017 committee to see if this is against the rules.