I'd like to prime a browser to take special actions on ethereum addresses or tx, potentially opening user's default local client programs, or linking to sites like etherescan.io, etc.
Is there any HTML treatment standard like that of mailto: or sms: for crypto addresses of any kind?
I am explicitly not looking to create a custom handler, but whether there exists a standard handler. (And that answer may simply be no.)
This has been discussed. Per comments, the answer is no.