CSS coding techniques
Great article. It should emphasize the part about !important even more.!important should be banned. !important divides the good guys from the bad guys. Whenever I see code with !important I instantly know that guy was lazy, unexperienced, wrong guided - you name it. And it also makes my life hard if I have to continue to work on that same css.I also miss one of the most useful methods to be more granular with the cascading. To apply a new rule, instead of using a fresh new class or to hammer into some new style definitions with an id/!important just use the class twice in your css. More of the same class means more important.  .button.button.button outranks .button.button which outranks .button. 

See here for an example:
http://codepen.io/gkey/pen/ONevEeIt's not beautiful and if you're doing css right you won't need it most of the time. But try this before using the big bad boys like an #ID or the !important statement.