[whatwg] <picture> redux

Tab Atkins Jr. jackalmage at gmail.com
Thu Nov 21 07:55:45 PST 2013

On Thu, Nov 21, 2013 at 1:39 AM, Simon Pieters <simonp at opera.com> wrote:
> On Wed, 20 Nov 2013 22:27:52 +0100, Tab Atkins Jr. <jackalmage at gmail.com>
> wrote:
>> We don't need to actually limit the MQs which are allowed in
>> <picture>.  The preloader is just an optimization in the first place;
>> we *want* the image to be preloaded, but if it isn't, the image will
>> still work, just slower.  We can provide a note about which types of
>> MQs are likely to be recognized by the preloader.  Unrecognized MQs
>> can just cause the preloader to ignore that <source>, and if that
>> means an incorrect source is selected, that's just a wasted download,
> Or maybe instead it should ignore the entire <picture> if it is unable to
> evaluate a MQ, to avoid the wasted download.

Yeah, either way seems reasonable, depending on how we want to balance
things.  We can even offer UAs a choice of behaviors, so in
bandwidth-constrained situations they can be more conservative, but
otherwise optimistically download the image that might work.


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