If You are an front end designer or developer then Codepen is an right platform. Codepen is an social development environment. Codepen is an perfect place to build and deploy a website, build test cases, show off your work and find inspiration too. In other words Codepen is the playground for the front end side of the website.
The new version of the COdepen Pro allows you to stepup to a next level with features like professor Mode and collab mode. Professor mode makes a group of students to follow you as you teach the code and simultaneously both can chat with each other, whereas the collab mode let you pair the program in real time.