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Tricks

Target only one browser version

#element { 
  color:pink \0/IE9; // (only for IE9!) 
} 

Source

Select all but the first

p + p {
  background: cyan;
}

Source

CSS Rules Priority

.footer { 
  .footer-item { 
    background: red; 
  } 
}

.footer-item { 
  background: green; 
}

In the end the nested property prevails: background: red;
Source

View variable value

span {
  $post: 'Vipers';

  &::after {
    content: $post; 
  }
}

Source