div.classname in css file

Question

I have seen some developers write

HTML:

 some content 

CSS:

Answer 1

That's exactly what it means. It's not good or bad practice, it depends completely on what elements you want specific classes to apply too. Sometimes you want a class to apply to all elements, other times you want the class to have different effects based on the element, such as having both span.test and div.test defined in the CSS.