In http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier, we find
the following:
"
In CSS, identifiers (including element names, classes, and IDs in
selectors <http://www.w3.org/TR/CSS21/selector.html> ) can contain only
the characters [a-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. Identifiers can also contain escaped
characters and any ISO 10646 character as a numeric code (see next
item). For instance, the identifier "B&W?" may be written as "B\&W\?" or
"B\26 W\3F".
"
The characters A-Z should also be allowed, as the example indicates, and
as the preceding bullet item states.
Best wishes,
Melinda
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Melinda S. Grant
Connectivity Strategist
Imaging & Printing Group
+1.541.582.3681
Melinda.Grant@hp.com <mailto:melinda.grant@hp.com>
