In order to properly install this, one should cd into .webppl after making that dir.
cd ~ # or however you get to the home directory
mkdir .webppl # make a folder called .webppl (if it doesn't already exist)
cd .webppl
npm install probmods/webppl-viz # install this node package
In order to properly install this, one should cd into .webppl after making that dir.