privacy – Confirming That Website Follow User’s Consents

I am working on my thesis to review some websites compliance with the given consents that the users give. Ideally, non-strictly necessary cookies should not be placed on the user’s browser before user gives consents. In reality, many websites still place them before obtaining their user’s consent by verifying it using Developer Tools.

In one of the website that I am observing, google analytics and Facebook pixel cookies are placed before user gives consent. The site offers granular consents option to choose only selected cookies (For example only analytic cookies like _ga cookies family) or also allow the targeting cookies such as _fbp.

Once I choose my choices (for example not allowing analytic cookies and targeting cookies), how can I confirm that the website follows of my consent?