What is a breakpoint in responsive Web design?
The point at which a media query is initiated
What is the advantage of using a percentage (e.g. 50%) width instead of a fixed (e.g. px) width for a “column” class in a responsive layout?
It’s adaptive to the varying degrees of differences.
If you introduce CSS rules for a smaller min-width after the styles for a larger min-width in your style sheet, the CSS rules for the smaller min-width will “win”. Why is that?
Priority’s defined by CSS.