When we have access to the code, what can we see there besides the DOM tree?

In addition to the DOM tree, when accessing the web page code, you can see:

• CSS styles — both inline and external style files that define the appearance of elements.
• JavaScript code — scripts that control the behavior of the page, handle events, and enable dynamic changes.
• HTML markup — the source code of the page, including tags, attributes, comments.
• Network requests — resources loaded by the page (scripts, styles, images, API requests).
• Console and logs — error messages, warnings, debug information.
• Browser storage — cookies, localStorage, sessionStorage, IndexedDB.
• Metadata and headers — information about the page, security settings, policies.

Thus, access to the code allows analyzing not only the DOM structure but also the behavior, styles, and interactions of the page.