[whatwg] Features for responsive Web design

[Markus Ernst]

Am 10.08.2012 12:06 schrieb Odin Hørthe Omdal:
> On Thu, 09 Aug 2012 18:54:10 +0200, Kornel Lesiński
> <kornel at geekhood.net> wrote:
>
>> One stylesheet can be easily reused for   pixel-perfect 1x/2x layout,
>> but pixel-perfect 1.5x requires its own sizes incompatible with 1x/2x.
>>
>>> Apart from it possibly being a self-fulfilling prophecy – isn't this
>>> too much premature “optimization” ?
>>
>> I think we can safely assume that authors will always want to prepare
>> as few assets and stylesheets as they can, and will prefer integer
>> units to fractional ones (1px line vs 1.3333px line).
>
> I don't see the big problem, I think the spec is fine here. Yes it
> allows for putting a float there, but authors won't use it, so what's
> the problem? The spec already say you should use the number to calculate
> the correct intrinsic size, and the implementation will know what to do
> with a float number there if someone finds an actual use for it.
>
> This isn't limiting it for the sake of making anything easier, it's not
> like "the x is an integer" is any easier than "the x is a float". And if
> you *do* somehow find a good use for it down the line (and I believe
> there might be, maybe 0.5x) it'll be there and work. No harm. :)

One hypothetic use case for 0.5x could be: Future UAs may want to 
progressively load sources in order to display a lowres image very 
quickly, and increase quality if there is enough bandwidth to do so, 
similarly to what we know from interlaced GIFs. Authors then might want 
to provide 0.5x and even 0.25x sources for this purpose.