How can you implement A/B testing using Google Tag Manager without directly modifying the website's source code, and what variables would be essential?

To implement A/B testing using Google Tag Manager (GTM) without directly modifying the website's source code, you can use custom HTML tags to inject JavaScript code that modifies the page content dynamically based on user assignment to different test groups. First, use a JavaScript variable to generate a random number (e.g., 0 or 1) and store it in a first-party cookie. This cookie will determine which version of the page a user sees and ensures they consistently see the same version across multiple visits. The cookie's name should be descriptive, such as 'ABTest_Homepage_Version'. Then, create two c....