How to distribute HTML list items evenly in an unordered list

Yet another approach. This is something I use when trying to span a menu evenly across the page. It is nice if you have a dynamic menu that will change depending on certain conditions (like an admin page that only shows up if you are logged in as an admin).

CSS:

nav div ul {
display: table;
width: 100%;
list-style: none;
}
nav div ul li {
display: table-cell;
text-align: center;
}
nav div ul li a {
display: block;
}

I was kinda lazy, and just copied this from my current project, so you will have to adapt it to fit your code, but it is my preferred method of creating a horizontal menu

EDIT: You can make it look like it spans better by adding this:

CSS:

nav div ul li:first-child {
    text-align: left;
}
nav div ul li:last-child {
    text-align: right;
}

again, untested, just typed.

I have two answers for you.

If you want to stick with the float model:

Your ul element needs to have the overflow property set (without this property, your ul (or any element containing floated elements) is not given a height (this is expected behavior, mind you: http://www.quirksmode.org/css/clearing.html) and will therefore default to a height of 0 - the effect of this will be that if you set different background colors for your ul/li and body, the background of your ul will not seem to display).

ul {
    text-align: center;
    width: 300px;
    overflow: auto;
}

Your li elements need to have widths set, otherwise - as floated elements - their width will be set to whatever they contain. I've used pixels, below, but you can use a percentage value too.

li {
    float: left;
    margin: 5px 0 5px 0;
    width: 100px;
    text-align: center;
}

Use the display:inline-block property for your li elements (if support for old browsers isn't a priority). IE 7 does not support this, so it's not useful if you need wide cross-browser support, but it creates the effect you want - though make sure you then delete any spaces between your </li> and <li> tags, otherwise they will be counted in the overall width and will show up as spaces between the elements.

One advantage that this method has is that you don't have to know or set the width of the container ul if you use percentage widths on your contained li elements, you still get the centering for free with the text-align property you already have. This makes your layout very responsive.

Here's markup and CSS that works the way I think you are requesting:

Markup:

<ul>
<li>banana</li><li>orange</li><li>apple</li>
</ul>

CSS:

li {
    display:inline-block;
    margin:5px 0 5px 0;
    width:33.33%;
}
ul {
    text-align: center;
}

• If you'd rather keep the markup on multiple lines, then you'll have to fiddle with the left and right margins of your li elements in the CSS.
• If you add li elements, you'll have to change the percentage width to match (for example, with four li elements in your markup, you'd need to change your CSS to have a width of 25% for each one).

You'll need to set the width of the li elements to force them to fill the space:

ul {
    width: 100%;
}
li {
    float: left;
    width: 33%;
}

(Fiddle demo)

If you add more items to the list, you'll need to adjust the percentage width - eg with four items, the width will be 25%.