Google Tag Manager (GTM) uses an iframe to load and execute tags on a website for a couple of reasons:
While it's possible to use the script DOM element to load GTM, doing so would require more complex implementation and could potentially introduce security risks. The iframe approach used by GTM helps ensure a simpler and more secure implementation for tracking and managing tags on a website.
Additionally, using the iframe allows Google Tag Manager to separate its functionality from the website's code. This separation makes it easier to update and maintain GTM without impacting the website's code. It also allows for better control over when and how the tags are loaded, as well as providing a more consistent and reliable experience for users. Overall, using an iframe provides more flexibility, security, and ease of use for implementing Google Tag Manager on a website.