title: h1{} and h1, h1{} differences on css
body: <p>I would like to know what the differences between (it always choose pink and green):</p>
  
  <pre><code>h1 {color:red;}
  h1, h1 {color:pink;}
  p {color:blue;}
  p, p {color:green;}
  </code></pre>
  
  <p>Moreover in this example the hover does not work</p>
  
  <pre><code>a, a:visited {
  color:green;
  text-decoration:none;
  outline:none;
  }
  
  a:hover{
  color: red;
  }
  </code></pre>