To check out and include:
- http://webdevchecklist.com/
- https://asafaweb.com/
- https://www.owasp.org/index.php/XSS_(Cross_Site_Scripting)_Prevention_Cheat_Sheet
- http://jonassebastianohlsson.com/specificity-graph/
A list of elements that needs to be defined for the website to be ready for big action.