<section>
  <p>Lorem Ipsum is simply ...</p>
  <span>
    <div>Lorem Ipsum has been ...</div>
  </span>
</section>

 <footer>Lorem Ipsum © 2000
body {
  background: #F00;
}
p {
  margin: 0 #F00;
  missing-property: 20px;
}
<section>
  <p>Lorem Ipsum is simply ...</p>
</section>
-----------------------------------------
p {
  margin: 0;
  padding: 0;
}
p > a {
  color: #00F;
}
.cool-style {
  color: #BADA55;
}
describe('Given the Header component', function () {
  before(function () {
    ...
  });
  describe('when the user ...', function () {
    it('should open the menu', function () {
      ...
    });
  });
});
          
expect(5).to.be.a('number');
var htmlStr = '<body><h1>Atomus</h1></body>';
var browser = require('atomus')();
browser
.external('libs/jQuery.js')
.external('libs/lodash.2.4.1.js')
.html(htmlStr)
.ready(function(errors, window) {
  ...
});