html - Make floating divs the same height

Question

I have 2 divs side by side. I don't know the height of them upfront, it changed according to the content. Is there a way to make sure they will always be the same height, even when one of them stretches, only with CSS?

I made a fiddle to show. I want the red and blue divs to be the same height...

http://jsfiddle.net/7RVh4/

this is the css:

#wrapper {
width: 300px;
}
#left {
    width:50px;
    background: blue;
    float:left;
    height: 100%;  /* sadly, this doesn't work... */
}
#right {
    width:250px;
    background: red;
    float:left;
}

Answer 1

You could try instead of using float, use display: table-cell. You might find some older browsers don't understand this rule however. See below:

#wrapper {
    display: table; // See FelipeAls comment below
    width: 300px;
}

#left {
    display: table-cell;
    width: 50px;
    background: blue;
}

#right {
    display: table-cell;
    width: 250px;
    background: red;
}