title: Viewer.js - links in PDF don't work when dynamically loading into an iframe
body: <p>I'm using Viewer.js to display PDFs on a site. There is a list of titles, and when a title is clicked I'm loading in the corresponding PDF into the viewer via an iframe. The links in the PDFs aren't working; I see on the <a href="https://viewerjs.org/" rel="nofollow noreferrer">Viewer.js site</a> in the first example on the homepage there is a link working correctly. Why wouldn't they work on a PDF pulled into an iframe?</p>