zlacker

>>pabs3+(OP)
This is very simple, really:

Any browser that implements this, I will not use.

So any webpage that requires that API to be present, I will not be able to use. If your webpage requires this, I will not be a user of your website.

It is really that simple.

>>usrbin+Ee
Sounds great in theory but I'd suspect that you'd cave pretty soon after your bank adopts this (or whatever essential site/service you aren't considering is captured here).