Originally Posted by JSWolf
What I want to know is if the settings are changed like increasing the font size, does that mess with the line height?
The line-height is generated relative to the font size. That is if you set the line-height to 1.2, the reader will use a box 1.2 times the font size to display the line in. Some readers split the .2 to .1 above and .1 below while others just use .2 below. Visually, it makes very little difference unless your font goes overboard with ascenders, descenders and diacriticals on capitals. Alternatively, if you are using a line of all capital letters, you might actually want to drop the line height below 100% since there are no descenders and the lines tend to look wider than a mixed case line.