How do we run this?

Sorry if this is a dumb question, but how do we run this code?

I tried loading the html file in a browser, but got errors in the browser console...

Access to script at 'file:///D:/multipleWindow3dScene-main/main.js' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, isolated-app, chrome-extension, chrome-untrusted, https, edge. main.js:1

Failed to load resource: net::ERR_FAILED

Please advise (in simple terms!) how we run this amazing code.

Thanks