$ sudo apt-get update
$ sudo apt-get install libjs-modernizr 

libjs-modernizr is installed in your system.

Make ensure the libjs-modernizr package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjs-modernizr *

You will get with libjs-modernizr package name, version, architecture and description in a table

libjs-modernizr package basic information: