I take it all back..
It is a legit attribute.. but not a core attribute..
The summary attribute is used with non-visual media such as braille and speech to provide information about a table.
Quote:
The TABLE element takes an optional SUMMARY attribute to describe the purpose and/or structure of the table. The overview provided by the SUMMARY attribute is particularly helpful to users of non-visual browsers. With simple tables, a good CAPTION is usually a sufficient summary, but complex tables may benefit from a more detailed overview via the SUMMARY attribute. The following example uses SUMMARY to describe a table. Note that the summary could also be included in a paragraph before the table, which is helpful since few browsers support SUMMARY.
<TABLE SUMMARY="This table gives the character entity reference,
decimal character reference, and hexadecimal character
reference for symbols and Greek letters.">
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Dont you just hate it when your wrong...
DD