Question

Is there anyway that I can write a css value as mathematical expression?
Example:

div{
    height: 50% + 30px;
    width: 40em - 5px;
   }

If there is, it would be perfect.
PS: I don’t want to do it with JS or JQuery.

Answer 1

You can achieve this with css3 calc(). Write like this:

div{
    width: 40%;
    width: -webkit-calc(40% - 5px);
    width: -moz-calc(40% - 5px);
    width: calc(40% - 5px);
    height:50%;
    height: -webkit-calc(50% + 50px);
    height: -moz-calc(50% + 50px);
    height: calc(50% + 50px);
    background: green;
    color: white;
    position:absolute;
}

Check this http://jsfiddle.net/3QUw6/

Check this discussion for more Is it possible to make a div 50px less than 100% in CSS3?