I don't think it's a hard choice for the browser to make- send the data as it is captured by the camera. How that is displayed is something else, but as timdorr demonstrates, it's not difficult to toggle.
In what way? The developer should have no problem justifying the decision. "It's what the camera sensor sees".
I absolutely understand the application in webchat and why you would want it to be mirrored at a page level, but I'm at a loss to understand why the browser implementation would try to reflect that.
