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. When dealing with ...

Ryan Boudreaux covers the basics about CSS specificity hierarchy ... Count the number of element names and pseudo-elements in the selector and apply the value 0,0,0,1 for each or A=0, B=0, C ...

One of the more important details of understanding and using Cascading Style Sheets (CSS) is the cascading aspect of its name. That is, how are multiple rules for the same element handled?