Can XHTML and HTML class attributes value start with a number?

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No. They have to be SGML names. They “must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (“-“), underscores (“_”), colons (“:”), and periods (“.”).

However, class names that start with a number are supported by IE.

EDIT: meder pointed out that you can use Unicode characters and they seem to work in all browsers. I don’t know if it complies with the specifications, but it does seem to validate.
See http://css-tricks.com/unicode-class-names/ and http://snook.ca/archives/html_and_css/unicode_for_css_class_names

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