[css] Make outer div be automatically the same height as its floating content

I want the outer div, which is black to wrap its divs floating within it. I dont want to use style='height: 200px in the div with the outerdiv id as I want it to be automatically the height of its content (eg, the floating divs).

<div id='outerdiv' style='border: 1px solid black;background-color: black;'>
<div style='width=300px;border: red 1px dashed;float: left;'>
    <p>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
</div>

<div style='width=300px;border: red 1px dashed;float: right;'>
    <p>zzzzzzzzzzzzzzzzzzzzzzzzzzzzz</p>
</div>

How to achieve this?

Use jQuery:

Set Parent Height = Child offsetHeight.

$(document).ready(function() {
    $(parent).css("height", $(child).attr("offsetHeight"));
}

I know some people will hate me, but I've found display:table-cell to help in this cases.

It is really cleaner.

You may want to try self-closing floats, as detailed on http://www.sitepoint.com/simple-clearing-of-floats/

So perhaps try either overflow: auto (usually works), or overflow: hidden, as alex said.

First of all you don't use width=300px that's an attribute setting for the tag not CSS, use width: 300px; instead.

I would suggest applying the clearfix technique on the #outerdiv. Clearfix is a general solution to clear 2 floating divs so the parent div will expand to accommodate the 2 floating divs.

<div id='outerdiv' class='clearfix' style='width:600px; background-color: black;'>
    <div style='width:300px; float: left;'>
        <p>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
    </div>

    <div style='width:300px; float: left;'>
        <p>zzzzzzzzzzzzzzzzzzzzzzzzzzzzz</p>
    </div>
</div>

Here is an example of your situation and what Clearfix does to resolve it.

Firstly, I highly recommend you do your CSS styling in an external CSS file, rather than doing it inline. It's much easier to maintain and can be more reusable using classes.

Working off Alex's answer (& Garret's clearfix) of "adding an element at the end with clear: both", you can do it like so:

    <div id='outerdiv' style='border: 1px solid black; background-color: black;'>
        <div style='width: 300px; border: red 1px dashed; float: left;'>
            <p>xxxxxxxxxxxxxxxxxxxxxxxxxxxxx</p>
        </div>

        <div style='width: 300px; border: red 1px dashed; float: right;'>
            <p>zzzzzzzzzzzzzzzzzzzzzzzzzzzzz</p>
        </div>
        <div style='clear:both;'></div>
    </div>

This works (but as you can see inline CSS isn't so pretty).

Use clear: both;

I spent over a week trying to figure this out!