<div class="container">
  <h3>The spacing between these words is <em>increased</em> by <code>2em</code></h3>
  <div class="words">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Necessitatibus earum ut alias doloremque esse. Porro maxime dicta veniam molestias sed modi sunt sapiente eum nostrum consequatur accusantium facilis blanditiis nihil.
  </div>
</div>

<div class="container blocks-container">
  <h3>The spacing between these inline-block level elements is <em>increased</em> by <code>2em</code> when you hover over their container (<code>word-spacing</code> is transitionable)</code></h3>
<div class="blocks">
  <div class="block"></div>
  <div class="block"></div>
  <div class="block"></div>
  <div class="block"></div>
  <div class="block"></div>
</div>
</div>
body {
  background-color: #F5F5F5;
  color: #555;
  font-size: 1.1em;
  line-height: 1.5;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.container {
  margin: 50px auto;
  max-width: 700px;
}

.words {
  background-color: #0099cc;
  color: white;
  padding: 1em;
  word-spacing: 2em;
}

.blocks {
  -webkit-transition: word-spacing .6s ease;
  transition: word-spacing .6s ease;
}

.blocks:hover {
  word-spacing: 2em;
}

.block {
  display: inline-block;
  width: 100px;
  height: 100px;
  background-color: #0099cc;
}