• HTML→
• 2→
• 3→
• 3.2→
• 4→
• 4.01

• XML→
• XHTML1→
• 1.1→
• 1SE→
• 2

• Web Forms 2 →
• Web Apps 1 →
• HTML5

• except Internet Explorer 8 and earlier

• Use a nested div with semantic class name, e.g.:

  <article><div class="article">
    ...
  </div><article>
  ...
  

  
  .article { /* article styling here */ }
  

<article><div class="article hentry">
  ...
</div><article>

<div class="hgroup"><hgroup>
  ...
</hgroup></div>