What is the best way to center an html element within its containing element?

Question

Let's say you have the following chunk of code:

<div id="container">
<someelement>This is any element.</someelement>
</div>

What's the best CSS I could use to horizontally center "someelement" within its containing div?

Answer 1

Try

<someelement style="margin-left:auto;margin-right:auto">This is any element</someelement>

Answer 2

JaredPar has the right idea, but here's a cleaner way to do what you're looking for ;)

#container {
    text-align: center;
}

#container someelement {
    margin: 0 auto;
    text-align: left;
}

Answer 3

if your <someelement> is an inline element (i.e defaults to display: inline) apply text-align: center to its container. If <someelement> is a block element set left and right margin to auto and remember to set a width (block elements default to take all available horizontal space unless a width is stated explicitly). You may have to use both methods if you want it to work in IE 5.5 and below too.