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3.2.3.8 Embedding custom non-visible data with the data-* attributes http://www.w3.org/TR/html5/elements.html#embedding-custom-non-visible-data-with-the-data-attributes There is a note that reads: -- All attributes on HTML elements in HTML documents get ASCII-lowercased automatically, so the restriction on ASCII uppercase letters doesn't affect such documents. -- Later in the section there are several references to ASCII-lowercasing and ASCII-uppercasing operations. There is no discussion of how to handle non-ASCII Unicode values (the wisdom of any such appearing in this context is, of course, open). Default Unicode case folding might be a good idea here, though, if such values are expected to occur?
This is just for names, not values. Ideally there'd be no folding at all, it's just we're required to for legacy compat.
(I should probably make it clearer that this is for names, not values.)
This bug was cloned to create bug 17981 as part of operation convergence.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the Editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the Tracker Issue; or you may create a Tracker Issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy-v2.html Status: Accepted Change Description: https://github.com/w3c/html/commit/fca6b97b872ce58eae092758c499a15376de9a0e Rationale: accepted WHATWG change