> The suggestion to have the OS responsible for rendering is precisely to deal with the case of an untrusted source Your web browser is an untrusted source? Yo

> The suggestion to have the OS responsible for rendering is precisely to deal with the case of an untrusted source Your web browser is an untrusted source? You might be confusing the browser for the sites it displays. Browser vendors are unlikely to fight you trying to make copy & paste a better experience, they just lack ideas or a good solution that works across application/OS boundaries. In any case the OS wouldn't need the web browser to tell it how to display the text representation.