title: Insecure content in iframe on secure page
body: <p>I'm in the in the process of developing an application for a client, which will have an SSL certificate and be served under https. However, to integrate with their existing site they want to provide their navigation inside an iframe.</p>
  
  <p>I can see this causing trouble, as I'd expect the browser to complain about the mix of secure and insecure content on the page. I've had a look at similar questions on here and they all seem to refer to this the other way round (secure content in the iframe).</p>
  
  <p>What I'd like to know, then, is: will it cause issues to have insecure content included inside an iframe, placed on a secure page , and if so what sort of problems would they be? </p>
  
  <p>Ideally if it's not a good idea (and I have a strong feeling that it isn't) I need to be able to explain this to the client.</p>