Well the definition of a "virus" have expanded greatly over the years. The original definition was a piece of code that would latch onto binaries, and be sprea

Well the definition of a "virus" have expanded greatly over the years. The original definition was a piece of code that would latch onto binaries, and be spread that way. And those had telltale signatures (a virus may have added a jump at the start of the binary to the end, where a copy of the virus code resided, and then jumping back to the beginning of the actual program code). And i am not so sure there is much distinction between visiting a JS heavy site and running a program locally these days. After all, we are seeing the likes of Google exposing USB and Bluetooth via JS APIs now.