Sure. But it's not the browser that did that. You see the dialog because the app HANDLED the error condition, and application code displayed an dialog. Had the

Sure. But it's not the browser that did that. You see the dialog because the app HANDLED the error condition, and application code displayed an dialog. Had the error not been handled, the browser's behavior is to log a message to the browser console (which you, as a user, never see), and carry on, pretending that the error never happened. So the page would have continued on in some non-functional, or half-functional state.