Which is faster: repeating styles or repeating selectors?

Question

I would like to know which of the following examples will perform better. If performance is the same, which one reads better?

Example 1 (Repeating Selectors)

.helpfulCommenter, .questionTroll { color: #f00; }

.questionTroll { text-decoration: line-through; }

or

Example 2 (Repeating styles)

.helpfulCommenter { color: #f00; }

.questionTroll { color: #f00; text-decoration: line-through; }

I know the class names are not semantic and the particular styles demonstrated here are irrelevant. I just want to know which of these do browsers have an easier time parsing and implementing.

Answer 1

The performance difference is so minuscule it's irrelevant.

Shy away from example 2 as it will, most likely, become a maintenance headache if abused.