What is line-height:1?

Question

It is a question about the appointment of line-height.

I began study of css. line-height: Examples appointing 20px or a unit are often found. It is sometimes line-

Answer 1

Possible Values

number :

Sets a number that will be multiplied with the current font-size to set the distance between the lines

length :

Sets a fixed distance between the lines

% :

Sets a distance between the lines in % of the current font size

take from http://www.w3schools.com/css/pr_dim_line-height.asp