How to center the element – what to use instead of align:center attribute?

Assuming your markup looks something similar to this:

<form>
<fieldset>
<legend>Person:</legend>
Name: <input type="text" size="30" /><br />
Email: <input type="text" size="30" /><br />
Date of birth: <input type="text" size="10" />
</fieldset>
</form>

Your CSS should look something like this:

legend {
    margin:0 auto;
}

that’s easiest

Oh Dear… You have chosen probably the most difficult thing in CSS when it comes to cross-browser compatibility. Cameron Adams said it best

Probably the only difficulty in
styling semantic forms is the legend
tag. It is insufferably variable
across browsers. In Mozilla, the
legend tag is not left-indented from
the body of the fieldset, in IE and
Opera it is. In Mozilla, the legend
tag is positioned in between the
fieldset’s border and its content, in
IE and Opera it is positioned inside
the content. This makes it very hard
to move the legend inside the fieldset
border, or position it flush to the
left of the fieldset, as you get
varying effects across browsers

You can read more about what he said at Fancy Form Design Using CSS on how to style forms.

My solution to the problem would be to remove the fieldset border completely and absolutely position the legend element. The problem with what you want to do is that it is different in every browser.

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