codepen.io code example

Example 1: codepen.io

The best place to build, test, and discover front-end code.
CodePen is a social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn and debug, and find inspiration.

Example 2: codepen

shortcuts
https://codepen.io/basilbeltran/pen/abZejPo
https://blog.codepen.io/documentation/key-bindings/
https://codemirror.net/keymap/vim.js

Example 3: codepen

Object.assign({},qp);