title: Multiple classes in CSS Selector
body: <p>I see a selector like this,</p>
  
  <pre><code>.class1 .class2 .class3 {
  }
  </code></pre>
  
  <p>What does this mean?</p>
  
  <p>I've used multiple class selectors without spaces. Space means descendant but it doesn't make sense for classes.</p>