[Bug 18555] New: title="<white-space>" should not cause a tooltip

https://www.w3.org/Bugs/Public/show_bug.cgi?id=18555

           Summary: title="<white-space>" should not cause a tooltip
           Product: HTML WG
           Version: unspecified
          Platform: PC
               URL: http://dev.w3.org/html5/spec/global-attributes.html#th
                    e-title-attribute
        OS/Version: All
            Status: NEW
          Keywords: a11y
          Severity: normal
          Priority: P3
         Component: HTML5 spec
        AssignedTo: dave.null@w3.org
        ReportedBy: xn--mlform-iua@xn--mlform-iua.no
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,
                    public-html@w3.org


Please see my change proposal for the meta generator issue: 

http://www.w3.org/html/wg/wiki/TitleKeyContentMark

During the writing of that proposal, it became evident that Firefox does not
render a tooltip if the only content of a @title attribute is  white-space.

This seems to be the case for most/all of the characters of the White_Space 
and the Pattern_White_Space cathegory
http://unicode.org/Public/UNIDATA/PropList.txt

(However, it - somewhat illogically - fails to avoid the tooltip for the
characters with 'ZERO WIDTH' as part of its name.)

The Firefox behavior seems useful because it

   (a) avoid unintended tooltips (presumably this is why Firefox
       has this behavior)

   (b) it allows the title attribute to be used - without visually
       disturbing sighted users - as an explicit 'key content 
       trigger' for images in lack of alt. (See my change prop
       for more data on this.)

Thus, I propose to require roughly the same behavior from all browser. 

Cross browser, this - or _almost_ this behavior - is only seen for the
MONGOLIAN VOWEL SEPARATOR character (U+180E). However, IE10 and Opera breaks
the cross browser unity ...

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Received on Tuesday, 14 August 2012 10:02:38 UTC