# Polyfills

## Further Reading

  - https://medium.freecodecamp.org/requiring-modules-in-node-js-everything-you-need-to-know-e7fbd119be8

# Polyfills

## Further Reading

  - https://medium.freecodecamp.org/requiring-modules-in-node-js-everything-you-need-to-know-e7fbd119be8

## Mutation Obserser

  - https://dom.spec.whatwg.org/#mutation-observers

Add link to mutation observer WHATWG spec
Add link to mutation observer WHATWG spec
