Bernhard Hagmann's Blog
Links
Source Codes
Windows Install
Links
Validators
W3C CSS Validator
https://jigsaw.w3.org/css-validator/
W3C *ML Validator
https://validator.w3.org/
Cheat Sheets
http://codecall.net/2014/04/03/best-cheat-sheets-for-designers-and-programmers/
Resources
http://subtlepatterns.com/