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Re: How responsive is responsive?

From: Brett Jankord <bjankord@gmail.com>
Date: Wed, 3 Oct 2012 11:37:26 -0500
Message-ID: <CALgdvz_wooJLj1BeEd7pvSBu6jy98ccBu7fGQgLd1mHdA6G2OA@mail.gmail.com>
To: Marcos Caceres <w3c@marcosc.com>
Cc: public-respimg@w3.org
Hi Macros,

I believe the element would stay responsive "for life". In your example,
"As I move my device from one orientation to another, does the picture's
content change? "

The picture content would change, though there needs to be some logic
probably provided by the browser vendors to load images from the cache if
the image has already been loaded instead of sending another http request.

Using your example, "what should happen when the user swaps from landscape,
to portrait, and back to landscape again?"

The browser would load the image initially requested in landscape
orientation, upon orientation change to portrait the browser would request
the new img src for that source tag, upon the user going back to landscape
orientation, the browser would load the landscape image from the browser
cache instead of sending another request to the server. This is my
understanding from discussions in the community group. I believe a lot of
it depends on if its possible for browser vendors to do something like this.

Regards,

Brett Jankord

On Wed, Oct 3, 2012 at 11:23 AM, Marcos Caceres <w3c@marcosc.com> wrote:

> Hi,
> Just wondering, when it comes to specifying <picture> (assuming it is the
> right solution), how "responsive" do we want the <source media> attributes
> to be.
>
> Consider, when you use <source> with a video element, the first <source>
> that is matched is the one that is used by the browser ("for life").
>
> For example, in the following "movie_5.ogv" is chosen:
>
> <video controls>
>     <source media="all and (min-width: 100px)" src="
> http://media.w3.org/2010/05/video/movie_5.ogv">
>     <source media="all and (min-width: 300px)" src="
> http://media.w3.org/2010/05/bunny/movie.ogv">
>     <source media="all and (min-width: 600px)" src="
> http://media.w3.org/2010/05/video/movie_300.ogv">
> </video>
>
> Once the @media is matched, that is the media that is used for the life of
> the application (unless src is changed via script). It does not matter if
> the media changes after the source is set. In other words, <video> is not
> "responsive" in that it does not constantly respond to changes to [CSS]
> media queries.
>
> When it comes to "responsive images", what should happen when the user
> swaps from landscape, to portrait, and back to landscape again?
>
> <picture>
> <source
> media="screen and (orientation:portrait)"
> src="portrait.png">
>
>
> <source
> media="screen and (orientation:portrait)"
> src="landscape.png">
>
>
> </video>
>
> As I move my device from one orientation to another, does the picture's
> content change? Or does it behave like in video, that once the media is
> chosen, that's always the one that is shown?
>
>
> Kind regards,
> Marcos
>
> --
> Marcos Caceres
>
>
>
>
Received on Wednesday, 3 October 2012 16:37:54 GMT

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