title: In Chrome extensions, why use a background page with HTML?
body: <p>I understand that the background page of a Chrome extension is never displayed. It makes sense to me that a background page should contain only scripts. In what situations would HTML markup ever be needed? </p>
  
  <p>At <a href="https://developer.chrome.com/extensions/background_pages" rel="nofollow">https://developer.chrome.com/extensions/background_pages</a> there is an example with an HTML background page, but I haven't been able to get it to work (perhaps because I am not sure what it should be doing).</p>
  
  <p>Are there any examples of simple Chrome extensions which demonstrate how HTML markup can be useful in a background page?</p>