Html works in sets of boxes or frames that make up the overarching functionality of the website. The coding of HTML frames everything and everything within that code can be registered as working code (if correct). The body of the code lies within the HTML and it shows everything that will show up on the screen.
Code is for the streets
Everyone has access to see what code makes up any website on the web. A playground of knowledge which used to be a great study practice for those studying coding. The coding for a webpage may differ depending on the software.
CSS
CSS works in imaginary boxes and then applies rules and regulations to those boxes. The CSS coding makes up the visual aspects of the HTML code. This could be the font choice, color, objects, pictures, etc. The CSS code can be understood in 2 parts of selector and declaration.