HTML and CSS Reference
The third is to understand how elements are positioned on screen, and how they interact
with one another. There are several ways to position elements on screen, and several differ-
ent ways elements of different types can interact with one another.
The forth is to understand the way styles do or don't inherit styles from their parents. For
instance, if a table element has a background color of blue, should its tr and td children
inherit this style. Some styles cascade, and some (for good reason) do not.