У вашего броузера проблема в совместимости с HTML5
Demonstration of how to give users permissions to execute commands as sudo in a Linux operating system. Includes example of allowing user to execute a selected set of commands as root. Commands/files: sudo, /etc/sudoers, /etc/sudoers.d, adduser, /etc/group. Created by Steven Gordon on 7 March 2012 at Sirindhorn International Institute of Technology, Thammasat University, Thailand.