[html] How to horizontally center an unordered list of unknown width?

It depends on if you mean the list items are below the previous or to the right of the previous, ie:

Home
About
Contact

or

Home | About | Contact

The first one you can do simply with:

#wrapper { width:600px; background: yellow; margin: 0 auto; }
#footer ul { text-align: center; list-style-type: none; }

The second could be done like this:

#wrapper { width:600px; background: yellow; margin: 0 auto; }
#footer ul { text-align: center; list-style-type: none; }
#footer li { display: inline; }
#footer a { padding: 2px 12px; background: orange; text-decoration: none; }
#footer a:hover { background: green; color: yellow; }

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