CefSharp - Running JavaScript continuously in the background

Question

I would like to know if it possible to run a JavaScript script continuously in the background of a CefSharp application, having it start upon the application first opening and run until it is closed.

Specifically, I am utilising a JavaScript-based eye tracking library. Upon the application opening, the user needs to calibrate the eye tracking. Once calibrated, this script needs to run in the background sending tracking information to other pieces of JavaScript.

Currently, all JavaScript is loaded and executed on the main frame. So, when the user navigates to new pages using the browser, execution ends and all the JS is re-loaded and re-executed upon the frame loading again. This makes it so that the user is prompted to re-calibrate the eye tracking on each new page load, whenever I need it to be performed only once.

The JavaScript files that are re-loaded need to be re-loaded, as they interact directly with the DOM and so need to access the information of newly loaded pages.

It'd be preferable for these re-loaded JavaScript files to be able to interact directly with the continuously running background code, but it is also possible to establish communication through a WebSocket.

Currently, I am not sure if this is even possible and if it is I do not know how to go about it.

I attempted to spawn a new separate frame that is never re-loaded and running the background JavaScript there - but I did not get very far. The application I am building on does not currently support multiple tabs (there seems to be no UI available for it, etc), hence why I found it difficult to spawn a new frame that the user can interact with briefly.

Apologies for the lack of code snippets - many thanks in advance.