When the script is embedded in the website correctly, the accessibility virtual layer is applied on each visited page, scan for accessibility violations and manipulate it to create a fix for it.
When the script is embedded internally the plugin monitors the behavior of end-users. by doing so it is able to identify static and dynamic content on the fly, and to cover more content of each scenarios of the end-user.
When the script is embedded in your website and end-users are visiting a page the script executes and call the accessibility servers for authentication.
The domain URL is being verified and only when authenticated the accessibility is downloaded and the virtual layer is applied.