Teaching designers about flexible box layout for nearly a decade, Flexbox Froggy is probably the most well-known CSS game. For good reason, too. Not only is flexbox one of the trickier CSS concepts to ...

There are also more advanced selectors available in CSS, other than the three main ones that we covered (element, class, and id selectors) – like the attribute selector.

Because CSS is rendered by following a bottom-up parse, the most efficient coding targets the most specific element first (and by first, we mean the furthest-right selector).

Tony Patton focuses on CSS fundamentals and explains how multiple rules for the same element are handled. Multiple rules ensure that there will be no surprises for either you or the user community.

Ryan Boudreaux covers the basics about CSS specificity hierarchy in an effort to make this tricky concept easier to understand.