title: HTML page with sources from IPv6 and IPv4 only
body: <p>I have an HTML5 page available through IPv4 or IPv6.
  Css style and JavaScript is available from other domains only via IPv4.
  It does not work for pure IPv6 connection.</p>
  
  <p>Will it work well for connections that both IPv4 and IPv6 can do?
  Can it be a problem, for example, in some browsers?</p>