None of that matters. Just set the properties you want the element you are using to what you want it to be. No need to think about any other elements except the ones you use and, when you set a property, it will be the same across all browsers. No need to give it a name or import it into your style sheet.

No thinking involved at all outside of your normal design method. No need to investigate the latest trends or activities by some online guy. Just do what you do.