HTML5 Sections and Subsections

gistfile1.html

<section id="portfolio">

  <h1>Portfolio</h1>

  <section id="work">
    <h2>Work</h2>
    <!-- work goes here -->
  </section>

  <section id="open-source">
    <h2>Open Source</h2>
    <!-- open source goes here -->
  </section>

</section>