While the “WebDAV” part is somewhat not obvious, you might consider including the SharePoint/ASPX saving option as if you have it available is absolutely the simplest.
- Download empty.html
- Save it as empty.aspx
- Copy it to a SharePoint/OneDrive for Business sync’d library
- Open it online
That’s it, no further configuration necessary - works on desktop and syncs with mobile where it works great! I know the subset of users with OneDrive for Business/SharePoint might be small (or at least not vocal here - me and @TW_Tones anyways). I will acknowledge that as we’ve discussed before, I have heard that some configurations of SharePoint have had the WebDAV piece disabled, so maybe it’s risky to talk about too much, and have users in that situation get frustrated…