vBulletin Manual - <legend>

CSS Selector: legend

Elements within forms in vBulletin are often grouped inside a <fieldset> tag. The titles of these fieldsets are set inside <legend> tags, which take their styling from the <legend> class.

For best results you should usually only specify attributes relating to the text/font for this class, as specifying other attributes such as background color may produce unpredictable results.

Example of element using this class:

<form>
    <fieldset>
        <legend>This uses the Legend class</legend>
        <div>Some form elements here...</div>
    </fieldset>
</form>