W3C home > Mailing lists > Public > www-style@w3.org > November 2013

Re: [mediaqueries4] zoom-ratio as a media feature

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Sun, 10 Nov 2013 09:01:35 -0800
Message-ID: <CAAWBYDAAGNK=p5nuNZ6jEMfA6FSQDT8qkt6Z=HriDyvbi3R=cA@mail.gmail.com>
To: Florian Rivoal <florian@rivoal.net>
Cc: Alex Bell <alex@bellandwhistle.net>, Rick Byers <rbyers@chromium.org>, Simon Sapin <simon.sapin@exyr.org>, "www-style@w3.org" <www-style@w3.org>, "eae@chromium.org" <eae@chromium.org>
On Sat, Nov 9, 2013 at 6:41 AM, Florian Rivoal <florian@rivoal.net> wrote:
> Following up on what we had discussed during the conf call, I think the
> rough consensus was if we should do anything, it should be through the
> existing resolution / device-pixel-ratio MQs, and that the different types
> of zooms should not all have the same influence on them.
>
> - Pinch zoom on mobile browsers does not affect the geometry of the
> viewport, and as they merely act as a magnifying glass, they should not
> offer via media queries the ability to trigger layout changes, so no MQ
> should change during this kind of zoom. The use case of serving high
> resolution images when zoomed in can already be served by image-set() and
> friends.
>
> - Zooms that just change the font size have no reason to affect the
> resolution/device-pixel-ratio MQs
>
> - The desktop style of zoom which enlarges everything while keeping the
> physical size of the window constant changes the geometry of the viewport,
> which is reflected in the width and height MQ. This type of zoom should also
> change the resolution / device-pixel-ratio.
>
> Do we want to put that in the spec, or do we prefer to leave zooming
> undefined as has been historically the case in CSS? I believe that there is
> value here in specifying this, even though we may want to be careful in the
> phrasing to allow other types of zooming to emerge.

We need to put it in *some* spec, and MQ is an appropriate place for it.

I believe your characterization of the zoom as "affecting the geometry
of the viewport" is fine.

~TJ
Received on Sunday, 10 November 2013 17:02:22 UTC

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