We have embedded our public roadmap in an iframe (e.g. see http://roadmap.mambu.com) but it loads for quite a while and the user might think something is broken because for a couple of seconds nothing is displayed on the iframe.
Thank you for the idea. Shared webpages should now have a loading indicator. The status of this idea was out of date. You can learn more here: https://www.aha.io/support/roadmaps/strategic-roadmaps/collaboration/share-aha-views-externally