What non-tech forced standards might we want?

In a weekly spec discussion the following question came up?

Are there behaviors and standards we want to encourage and even potentially enforce (somehow) in these areas we don’t control?

Here is a thread to keep track of what these things (if any) might be.

The on that immediately comes to mind is the specific one from our discussion: media formats - how prescriptive should we be on media formats and capabilities? Probably not that prescriptive, and yet we need conventions on this.