http://3oamv2de6ooacy72hv3ulym3i3vvlprlkqas7hhzo4pu5nyxnji37zad.onion/blogs/writing-a-website-part-2
But be careful, the more nested the elements are, the more you burden the visitor's browser and their RAM, so we must try to reduce nesting as much as possible. Some elements cannot have any child (nested) element or text contents, they are called void elements.