[whatwg] An alternative to <picture> and srcset, is this realistic?
Tab Atkins Jr.
jackalmage at gmail.com
Mon May 14 08:55:51 PDT 2012
On Mon, May 14, 2012 at 5:34 PM, Matthew Wilcox <mail at matthewwilcox.com> wrote:
> Thanks for the feedback. Please also forgive me not being too
> technically aware of things at a browser level; so I'm not really sure
> how valid my feedback can be:
> The URI thing is actually using URI Templates, which are already
> pretty far along? http://code.google.com/p/uri-templates/ I thought
> this was a strong advantage of the idea.
I don't know of this having any traction within actual browsers. It
might be a good idea, I dunno.
> Putting the variables into the CSS would break the advantage of them
> being available to the browser *before* the browser starts trying to
> pre-fetch images, right? Any solution has to avoid the prefetch
> behaviour or else it fails; so I don't understand how they could be
That's why I mentioned an inline <style> at the top of the <body> -
I'm not sure if browsers skip past that when building the tree or not,
but it's *potentially* available.
> I am of the opinion that media queries actually belong in the head
> more often than they do elsewhere, both from a practical and semantic
> standpoint (see
I don't necessarily disagree. I wasn't arguing from a theoretical
standpoint, just supporting Anne's point that, from a practical
standpoint, putting things into <head> isn't always easy for authors.
> I had presumed that should multiple cases match the browser would
> simply uses the last matching one. There's already a polyfil in JS
> that does exactly that: http://jsbin.com/3/ecifaf/latest/
Yeah, you can't assume that. They're conditions, and a page can
potentially match multiple of them at once. For example, if your MQs
are "min-width: 1000px" and "min-width: 300px", a 1200px wide screen
will match both of them. You can *make* them exclusive by adding a
max-width declaration as well, but we can't depend on that happening,
so the behavior has to be specified somewhere.
Similarly, we can't depend on *any* of them matching, so there should
be a default case that is used when nothing else matches.
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