I don't know how else to say it, I don't care about whatever browsers gonna do. I don't need to wait for anything. You're describing Web Bundle exactly, which likely contemplates gotchas you haven't thought about. If you want to write a standard for zip files, this is what we tried with @hzrd149 long time ago, feel free to create a standard that we can reference (with a proper mime type) and I'll add it to the spec