HTML <class> tag question

[teksonline]

Is the value in class tag to be anything?

or are there restrictions such ass a-z or a-z0-9 etc

Any clues are helpful thanks

[teksonline]

nevermind

In CSS 2.1, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [A-Za-z0-9] and ISO 10646 characters U+00A1 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, or a hyphen followed by a digit. Only properties, values, units, pseudo-classes, pseudo-elements, and at-rules may start with a hyphen (-); other identifiers (e.g. element names, classes, or IDs) may not

[potter]

wow dude

[sam from montreal]

good to know