[html4all] Request for review of alt and alt value for authoring or publishing tools
Joshue O Connor
joshue.oconnor at cfit.ie
Tue Apr 15 14:44:54 PDT 2008
Ian Hickson wrote:
> There is *absolutely no practical difference* to the UA between omitting
> the alt="" attribute altogether, and having the alt="" attribute set to
> some magical reserved value. They are functionally identical, and user
> agents can get as much information from either.
Thats not entirely true. If you consider a UA like a screen reader which
will pretty much by default skip images that have a null alt value and
the other situation you cite where there is some reserved value that
will potentially trigger some kind of behaviour (which is undefined as
yet). The difference (an benefit) of this magical reserved value is that
the user may be able to choose to also ignore it via some verbosity
settings. Without this 'magical reserved value' the screen reader will
potentially default into heuristic evaluation which is not desirable
when interacting with an application - such as the much vaunted photo
sharing application - and its dynamically generated/random alphanumeric
URLs. [1]
So while in principle there may be no practical difference to the UA,
and I see your point, there is potential for a very real impact on the user.
Cheers
Josh
[1] http://www.paciellogroup.com/resources/articles/altinhtml5.html#apply1
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