The HTML head and body tags come from your source code and includes things like: open graph, schema, image file names, etc. You can see these things in your page's source code.
To see your source code:
1.) Open your page in Chrome
2.) Right click/Command Click (mac) on your page and then select view source code
3.) Your source will open in a new tab From your source code, you can control/command F to look for your exact keyword or important terms.