Make text height 100% of div?

Question

I'm trying to make the text 100% height of a div but it doesn't work.
It just becomes 100% of the body { font-size:?; }.

Is there any way to make it follow the div height?
The div height is 4% of the whole page and I wan't the text to follow it when you resize/change resolution.

Answer 1

To get the result I wanted, I had to use this code:

// Cache the div so that the browser doesn't have to find it every time the window is resized.
var $div = $('li.leaf.item');

// Run the following when the window is resized, and also trigger it once to begin with.
$(window).resize(function () {
   // Get the current height of the div and save it as a variable.
   var height = $div.height();
   // Set the font-size and line-height of the text within the div according to the current height.
   $div.css({
      'font-size': (height/2) + 'px',
      'line-height': height + 'px'
   })
}).trigger('resize');​

Thank you joshuanhibbert@css-tricks for the help!