sean, I get that there’s a colloquial convention for this in the UI design language (left off, right on), but it’s uaully accompanied by a label or at least a colour change.
This is especially complicated for an international audience (e.g. US power switches up for on; UK down for on).
I have a hard time believing this is not an intentional anti-pattern to trick users into doing the thing the website wants them to do (which is often the opposite of what the user wants to do).
Please don’t do this.