In practical terms and by way of example this means things like:
- All links must have a href.
- All forms must post to an endpoint that correctly handles the request.
#Real world examples
Closer to home in the UK, the default network-level blocking by Internet Service Providers (A.K.A. The David Cameron Porn Filter) also blocks some domains regardless of content, so although I might not (currently) care about any potential market in China, I do care about being reachable by a UK audience. It's unlikely to be a concern for me but it makes sense to prepare for any eventuality.
As always, let me know if you have any thoughts on this approach.