What do two dots in a CSS declaration mean?

Question

This is a bit of code from Twitter Bootstrap

.navbar .nav.pull-right .dropdown-menu,
.navbar .nav .dropdown-menu.pull-right {
  left: auto;
  right: 0;
}
         


        

Answer 1

This is my answer on a duplicated question. I've put so much effort in it that I wanted to share it with the "original" post.

It just selects elements with the classes "move" and "up". http://www.w3schools.com/cssref/css_selectors.asp

div{
  width: 60px;
  height: 60px;
  background: beige;
  border: solid black;
  float:left;
  margin: 10px;
  text-align: center;
  line-height: 60px;
  font-family: arial;
  font-weight: bold;
}
.separator{
  width: 5px;
  height: 60px;
  border: solid black;
  background: grey;
  clear: both;
}



.move.up{
  background: green;
}


//Additional knowledge
.class1 .class2{
  background: orange;
}
span div{
  background: purple;
}

.class3, .class4{
  background: brown;
}

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