The discussions about the suitability of Google Docs and LibreOffice makes me wonder - is there a benchmark website for file format compatibility verification?

The discussions about the suitability of Google Docs and LibreOffice makes me wonder - is there a benchmark website for file format compatibility verification? If not it may be a very useful to create one and just host it on, say, GitHub pages. We could upload complex, but reasonably common, documents in various file formats for corresponding softwares, and create easy to read checklists of the different failure modes when trying to open the file in a different software from one in which it was authored.