[whatwg] The src-N proposal

Tab Atkins Jr. jackalmage at gmail.com
Tue Nov 19 17:52:22 PST 2013

[sorry for the repeated emails]

On Tue, Nov 19, 2013 at 5:47 PM, Tab Atkins Jr. <jackalmage at gmail.com> wrote:
> On Tue, Nov 19, 2013 at 2:22 PM, Tab Atkins Jr. <jackalmage at gmail.com> wrote:
>> Using a url/size pair in src=''
>> would be invalid if sizes='' wasn't specified.
> On second thought, this isn't necessary.  You can always set <img
> width>, or just let it take the default intrinsic width of 300px.
> <picture sizes> would just override the intrinsic width of the <img>.
> After all, even if your image isn't variable-sized, using the url/size
> syntax might still be easier than url/density, because you don't have
> to do any math, or change the densities around when you change the
> image size.

This means, then, that it's actually legitimate to mix url/density and
url/size pairs, so we don't even need separate grammar clauses.  The
url/size pairs just get turned into url/[effective density] pairs,
calculated from the intrinsic size (possibly modified by <img width>
or <picture sizes>).

This also means that you can use <picture sizes> and url/density together.

None of these are particularly good ideas, mind you; I'm just saying
that there's no real reason to disallow them, or prevent them from
working with each other.  The concepts are actually fairly independent
in terms of operation.


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