Incorrect line-height property in calibre CSS ?

[Bertrand]

When converting with calibre, all line-height properties are written like this :

line-height: 1.2;

Shouldn't it be

line-height: 1.2em;

.calibre {
    display: block;
    font-size: 1em;
    line-height: 1.2;
}
.calibre4 {
    font-size: 1em;
    font-weight: normal;
    line-height: 1.2;
}
etc

[Starson17]

Originally Posted by Bertrand

When converting with calibre, all line-height properties are written like this :
line-height: 1.2;
Shouldn't it be
line-height: 1.2em;

No. The first form is unitless. The second form has units of em. If you use a unitless line-height definition, all descendants get the line height specified as a ratio of their units. If you use units, all descendants get the line height based on the parent line height. Unitless is the preferred way to define line heights.

[jackie_w]

I didn't know that Starson17. You learn something new every day. Thanks