According to HTML5 specification:
A class attribute must have a value that is a set of space-separated
tokens representing the various classes that the element belongs to.
... There are no additional restrictions on the tokens authors can use in
the class attribute, but authors are encouraged to use values that
describe the nature of the content, rather than values that describe
the desired presentation of the content.
Also, in the version 4:
The class attribute has several roles in HTML:
- As a style sheet selector (when an author wishes to assign style
information to a set of elements).
- For general purpose processing by
user agents.
Your use case falls under the second scenario, which makes it a legitimate example of using a class attribute.
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