Editing id vs class vs tag vs pseudo vs. attribute selectors

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

<style type="text/css">
  .bar { display: none; }
</style>
<div id="cheese">
  <h1>
    HTML Ipsum Presents
  </h1>
  <p>
    <strong>
      Pellentesque habitant morbi tristique
    </strong>
    senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam,
    feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam
    egestas semper.
    <em>
      Aenean ultricies mi vitae est.
    </em>
    Mauris placerat eleifend leo. Quisque sit amet est et sapien ullamcorper pharetra.
    Vestibulum erat wisi, condimentum sed,
    <code>
      commodo vitae
    </code>
    , ornare sit amet, wisi. Aenean fermentum, elit eget tincidunt condimentum, eros
    ipsum rutrum orci, sagittis tempus lacus enim ac dui.
    <a href="#">Donec non enim</a>
    in turpis pulvinar facilisis. Ut felis.
  </p>
  <h2>
    Header Level 2
  </h2>
  <ol>
    <li>
      Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
    </li>
    <li>
      Aliquam tincidunt mauris eu risus.
    </li>
  </ol>
  <blockquote id="foo" class="bar" name="baz">
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vivamus magna. Cras in
      mi at felis aliquet congue. Ut a est eget ligula molestie gravida. Curabitur massa.
      Donec eleifend, libero at sagittis mollis, tellus est malesuada tellus, at luctus
      turpis elit sit amet quam. Vivamus pretium ornare est.
    </p>
  </blockquote>
  <h3>
    Header Level 3
  </h3>
  <ul>
    <li>
      Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
    </li>
    <li>
      Aliquam tincidunt mauris eu risus.
    </li>
  </ul>
  <pre>
    <code>
      #header h1 a { display: block; width: 300px; height: 80px; }
    </code>
  </pre>
</div>
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