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Missing Resources Indicator (was: More on circular references)

From: Doug Schepers <schepers@w3.org>
Date: Thu, 19 Mar 2009 14:03:44 -0400
Message-ID: <49C28900.2060302@w3.org>
To: public-svg-wg@w3.org
Hi, Alexander-

Alexander Adam wrote (on 3/19/09 1:47 PM):
>>
>>  Note that this may not be the best indicator of error for every
>>  situation.  For an external resource (like a missing image), you might
>>  put up a missing-image icon; for a problem in progressive rendering, you
>>  might put up a flashing clock or an alert that content has stopped
>>  loading.  It's UA- and device-dependent, at this point, but giving some
>>  meaningful indication to the user that not everything may be as the
>>  author intended is the goal.
>
> Shouldn't it be possible to declare a standard "icon" in the svg spec to be
> used for missing references? As of now, Renesis v3 will show an explicit
> marker (defined as SVG;) when something is missing whereas other
> implementations (most of them) do actually behave as if there've been no
> fill / stroke for example, not sure what they do for images (Erik?). This
> might lead the author to be pretty much confused at the very end about
> what's going though as I am not sure whether he might really be able to
> automatically know that a no-fill / no-stroke might mean an
> invalid-reference thingy? Just my $0.02

Actually, we went pretty far down the line to defining this in SVGT1.2 
(I wrote up quite detailed spec prose for it, including allowance for 
fallback behavior), but we decided to back out... I don't recall why 
offhand.  I'd like to specify this in SVG2, if there aren't any 
blockers.  It would certainly clarify what's going wrong, for users.

Regards-
-Doug Schepers
W3C Team Contact, SVG and WebApps WGs
Received on Thursday, 19 March 2009 18:03:55 GMT

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