When you add 1 class behind another class, what does that mean?

[TechnoBear]

@asasass

When you add 1 class behind another class, what does that signify?

It gets very tiresome constantly answering the same questions.

@TechnoBear

.playButtona.active

No space between the class names means these are two classes both applied to the same element.

.activated .playButtone

Space between the class names, because one is a descendant of the other.

Class name active/activated placement - #37 by TechnoBear