This is a paragraph. Above me is a break. This shows as p.
This is a span. It only takes as much as it needs. It shows as span. A button does this too.^ This button uses document.querySelector('').innerHTML to change the head HTML and makes it have a link to the stylesheet and have the title of the tab be different. ^ This button is the same for body HTML.
Another thing is div. If you give it a class you can change only it with CSS and it can hold a whole bunch of things. That is how the header is made. It is a div with three more divs in it. It is showed with div.