How to align 3 divs (left/center/right) inside another div?

Question

I want to have 3 divs aligned inside a container div, something like this:

[[LEFT]       [CENTER]        [RIGHT]]

Container div is 100% wid

Answer 1

I did another attempt to simplify this and achieve it without the necessity of a container.

HTML

.box1 {
  background-color: #ff0000;
  width: 200px;
  float: left;
}

.box2 {
  background-color: #00ff00;
  width: 200px;
  float: right;
}

.box3 {
  background-color: #0fffff;
  width: 200px;
  margin: 0 auto;
}

CSS

  .box1 {
  background-color: #ff0000;
  width: 200px;
  float: left;
}

.box2 {
  background-color: #00ff00;
  width: 200px;
  float: right;
}

.box3 {
  background-color: #0fffff;
  width: 200px;
  margin: 0 auto;
}

You can see it live at JSFiddle