F17 - further notes following today's meeting

All,
I looked at F17 in a bit more detail and added the following notes into 
the WG Notes box at
https://www.w3.org/2006/02/lc-comments-tracker/35422/WD-WCAG20-TECHS-20140107/2904

    Following the call I researched a little more. I think we should use
    the text in the HTML5 spec to give a proposed change to bullet 4 of

    "For client-side image maps, check that the value of the usemap
    attribute is a valid hash-name reference to a map element."

    Hash-name reference in html5 is defined at
    http://www.w3.org/TR/html5/infrastructure.html#syntax-references.
    Perhaps this should be added in the resources section.

    On further thoughts perhaps we should genericise this even more to
    cover other cases which use hash-name references.
    Proposed steps in a more generic test procedure are:

    1) Check that attribute values that have an idref value have a
    corresponding id value.
    2) Check that attribute values that have a hash-name reference refer
    to a valid name or id.

    If step #1 or step #2 is false, then this failure condition applies
    and the content fails the success criterion.




-- 
Regards, James

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