Web Hosting - Previewing Your Site
Site developers can preview a website before a domain/DNS has propagated to a new location on a server in Web Hosting.
In most cases the Web Hosting Service will establish a preview URL to assist during site migrations from one server to another. See Web Hosting - Site Migrations to New Servers.
You can also preview your site via the Plesk Administrative Control Panel using the Site Preview feature pictured here:
Note: The Site Preview feature is available for HTTP only. Previewing of HTTPS pages is not supported. One more option for previewing your site is to add the records for the domain to the "hosts" file in your local operating system.