What is the liability and responsibility of software bugs?

JavaScript

Developers need to know four things to reproduce a bug:

->The operating environment. The browser, the source system, the type of mobile device, the operating system - anything that the programmer might assume wrongly about where the bug actually appears.

->The reproduction steps. Starting from a fresh environment, what does the user have to do in order to cause this problem?

->What actually happens. What goes wrong, such as a screen freeze with permanent hourglass, a pop-up error message (don't forget to include the message), perhaps a JavaScript error in the bottom-left hand corner of the window.