title: Responsive content inside an iframe
body: <p>I have written a web tool that helps designers create templates. They fix some things, and they reload the template with some data. The template is rendered inside an iframe, and I've added a control to change the iframe's width.</p>
  
  <p>When I change the iframe's width, the content doesn't look responsive, even if I reload the iframe contents. However, if I render the same content in a new window, instead of inside the iframe, resizing the browser window makes content adapt, so there is no problem with the HTML/CSS of the designers. </p>
  
  <p>So, how do I make responsive content adapt to the iframe width?</p>