Content Selection

• express alternate contents or ressources
• express conditions for delivery

<sel:select>
  <sel:when sel:expr="screen-width &gt; 400 and available-colors &gt; 4">
    <img alt="Many people had to be evacuated." src="imagebig"/>
  </sel:when>
  <sel:when sel:expr="screen-width &gt; 100 and available-colors &gt; 4">
    <img alt="Many people had to be evacuated." src="imagesmall"/>
  </sel:when>
  <sel:otherwise>
    <p>Many people had to be evacuated.</p>
  </sel:otherwise>
</sel:select>