title: In the summer of 2010 is it time to start using HTML5?
body: <p><em>I created this question as community wiki in the hope that it and its answers will be edited as the situation with HTML5 changes.</em></p>
  <h2>Time to use HTML5?</h2>
  <p>This question gets trotted out about once a year, so I might be beating a dead horse, but is it finally time (in the summer of 2010) to use HTML5 when developing a brand new web site?</p>
  <h3>Related HTML5 Questions on Stack Overflow</h3>
  <ul>
  <li><a href="https://stackoverflow.com/questions/1188770/is-it-time-to-start-developing-with-html5">Is it time to start developing with HTML5?</a> ('09 edition)</li>
  <li><a href="https://stackoverflow.com/questions/186264/is-it-time-to-start-using-html5">Is it time to start using HTML5?</a> ('08 edition)</li>
  <li><a href="https://stackoverflow.com/questions/5629/any-reason-not-to-start-using-the-html-5-doctype">Any reason not to start using the HTML 5 doctype?</a></li>
  <li><a href="https://stackoverflow.com/questions/2260252/is-there-any-pros-to-use-html-5-doctype-doctype-html-even-if-im-not-using-a">Is there any pros to use HTML 5 doctype <code>&lt;!DOCTYPE html&gt;</code> even if i’m not using any new HTML 5 tag?</a></li>
  <li><a href="https://stackoverflow.com/questions/1933241/is-valid-html5-ok-to-use-now">Is valid HTML5 OK to use now</a></li>
  <li><a href="https://stackoverflow.com/questions/3135580/is-it-too-early-to-use-html5">Is it too early to use HTML5</a></li>
  </ul>
  <p><strong>Edit as a follow on</strong></p>
  <p>Is it a mixed bag: i.e. use these tags safely but stay away from x, y, z?</p>