You want to look at the DOM structure of the page as it exists in the loaded page and have I got a treat for you! Figure out how to open the web inspector for your browser; the keyboard shortcuts are ctrl-shift-I or cmd-shift-I or cmd-opt-I on a few (platform, browser) pairs.

(This will show you the actual DOM, not the React components... but since you were talking about 'view-source', this might help you too.)