There is no need for alt attribute in those elements. Alt attribute is used for browsers that don't support pictures to display the text instead of the picture. I think you are thinking of a title attribute, the one that gives you a tooltip if you hover over the element with a mouse. Title attribute can be (AFAIK) added to virtually any element in html.
Code:
<a href="[URL unfurl="true"]http://www.google.com"[/URL] title="This is the most popular search engine">Google</a>
<td title="This cell displays the subject's age">27</td>
<p title="Opening paragraph of the new book.">The night was humid...</p>
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