W3C home > Mailing lists > Public > public-appformats@w3.org > November 2006

[XBL] prefetch element underspecified?

From: Marcos Caceres <m.caceres@qut.edu.au>
Date: Wed, 15 Nov 2006 10:18:04 +1000
Message-ID: <455A5CBC.4090301@qut.edu.au>
To: public-appformats@w3.org

Just wondering, does anyone else think that the behavior of the 
<prefetch> element is slightly underspecified? The spec provides limited 
answers to the following questions:

   Do prefetched resources load synchronously or asynchronously? (it is 
implied that it is asynchronous, but it doesn't say)

   While preloading, do these elements block the document's onLoad event 
until they have loaded?

   Once the element actually starts loading, should it fire an event on 
the implementation?

   Once an element has loaded, should it fire an event on the 

   If the element fails to load, should it fire an event on the 

   If the src attribute points to an invalid url, does the UA fire an 
event? or is it in error and ignored?

   If the author finds the prefetch taking too long, how can they cancel 
it? (Ie, should there be a scripting interface?)

   What happens when the MIME type of the prefetched resource is unknown 
to the User Agent?  for instance, the author prefetches 'foo.fum' of 
type 'application/apples'

   Can I access the internals of the data I have preloaded from the 
prefetch element? say, for instance, I load some RSS and I want to parse 
it? (ie. why use prefetch instead of XHR or just javascript?)

   What's the scope of prefetch? can prefetched resources, like images 
for example, be used  by a bound document? (implied no, but does not say)

Received on Wednesday, 15 November 2006 00:18:24 UTC

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