The style declarations contained within this page:
.test {background-color: silver;}
.cl1 {height: 50%; min-height: 100px;}
.cl2 {min-height: 50%;}
.cl2contain {height: 80px; border: 1px dotted gray;}
[test cl1] This 'p' element has a percentage height, which should be treated as 'auto', and a minimum height of 100 pixels.
The following 'div' has a class of 'cl2contain', and contains an image with a class of 'cl2'. The image should be a minimum of half the height of the content-height of the 'div' that contains it.