What is a Font Size?
Font Size: The size of a font, measured in points, from the lowest descender to the highest ascender. Source | More Info • What is a Line Height Line Height: This property determines the amount by which the height of each element’s line box is increased or decreased. Basically it is not a set measurement, but a calculation. In CSS, line-height is the difference between the values of line-height and font-size for a given element. The line-height property specifies the logical height of an inline element. This is the height used in the vertical alignment of inline elements and the construction of line boxes. It defines the height of the inline box for a given element. It determines the amount by which the height of each element’s linebox is increased or decreased.