We'll create fresh WordPress site with Force Frame installed. You have 20 minutes to test the plugin after that site we'll be deleted.
force-frame is a WordPress plugin that allows you to force your WordPress website inside an iframe in another website, with cross-domain support.
Links: Author’s Site
If you’re upgrading to version 1.2+ from a previous version, you will have to replace the iframe in the parent site with a script: please follow the instructions in the Force Frame settings page.