[whatwg] Simplified <picture> element draft

Maciej Stachowiak mjs at apple.com
Wed Jan 8 09:18:25 PST 2014

On Dec 31, 2013, at 7:17 AM, Yoav Weiss <yoav at yoav.ws> wrote:

> On Mon, Nov 25, 2013 at 5:33 PM, Adam Barth <w3c at adambarth.com> wrote:
>> Is there an editor's draft or some other relatively self-contained
>> write-up that I could review?
> Tab has rewritten the picture spec to match the latest proposal. You could
> review it at http://picture.responsiveimages.org/

This approach seems cleaner than src-n. I'll try to read it in more detail, but a few initial comments:

- Is there any reason not to allow the sizes="" attribute and the extended definition of srcset="" on <img> as well as <source>? It seems like the <picture> wrapper is not helpful in cases where you only use one <source> element.

- It seems this draft allows arbitrary media queries, with only a subset expected to give best performance (by correctly informing the preload scanner). In my opinion, this is worse than the alternative of only supporting the media queries that could plausibly be integrated with preload scanning. Creating a programming interface with a "performance cliff" - a point beyond which performance suddenly gets significantly worse for what seems like a small incremental change - is generally a bad idea. And the use cases for fully general media queries seem much more speculative than the ones for the simplified subset.


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