key of data-attribute


Return type:
Returns the true name of the attribute.
key of data-attribute of attribute-reference


The key of data-attribute operator returns the "true" name of the data-attribute. This is most useful when retrieving the real name of an data-attribute that is being referenced through an alias. The name is uppercased when the SGML declaration specifies NAMECASE GENERAL YES for the SGML document being processed.

Because data-attributes are always considered part of a shelf of attributes, it always makes sense to ask for the "key" of a data-attribute, even if the data-attribute form is used rather than data-attributes.