W3C home > Mailing lists > Public > www-style@w3.org > November 2012

RE: Behavior of device-pixel-ratio under zoom

From: Belov, Charles <Charles.Belov@sfmta.com>
Date: Thu, 15 Nov 2012 00:51:57 +0000
To: 'Sylvain Galineau' <sylvaing@microsoft.com>, Tab Atkins Jr. <jackalmage@gmail.com>
CC: Boris Zbarsky <bzbarsky@mit.edu>, "www-style@w3.org" <www-style@w3.org>
Message-ID: <C1BED60DEFFFB2479E3EE227BF749D2D5316BAD9@SV6EX10MBX1.muni.sfgov.org>
> -----Original Message-----
> From: Sylvain Galineau [mailto:sylvaing@microsoft.com]
> Sent: Wednesday, November 14, 2012 4:33 PM
> To: Tab Atkins Jr.
> Cc: Boris Zbarsky; www-style@w3.org
> Subject: RE: Behavior of device-pixel-ratio under zoom
> [Tab Atkins Jr.:]
> > On Wed, Nov 14, 2012 at 3:47 PM, Sylvain Galineau
> > <sylvaing@microsoft.com>
> > wrote:
> > > While it'd be nice to make everyone agree on a single approach
> > > across all UAs I agree with Roc it'd be nicer for now to agree on
> > > how we make the property consistently reflect both approaches at
> > > runtime. (At least I think that is the intent; correct me if wrong)
> >
> > I don't agree with the first part (I think the different approaches
> > are fine, and reflect the relative ease with which you can zoom+pan on
> > mobile vs desktop), but the second is definitely true.
> >
> By 'the first part' I assume you mean the first part of my statement
> ('It'd be nice to make everyone agree on...')? I also think the different
> approaches are fine though I can see how they also reflect legacy and
> folks might prefer to have a simpler model i.e. a new browser vendor could
> decide to only support optical zooming.

It would be a problem if a browser vendor chose to do that, specifically 
because it would require horizontal scrolling to read each line 
of a zoomed paragraph.  The spec needs to require that zoom-and-reflow
be available.
> In the meantime we still need to agree on the interactions of this
> property with reality.

> [Belov, Charles:] 
>> What would be nice is if the end user has the choice as to whether 
>> zoom occurs with or without reflow.  Specifically, zoom with reflow 
>> obviates the need to scroll horizontally multiple times in order to 
>> read a single paragraph.  On the other hand, zoom without reflow is 
>> good for navigation pages.
> That's a user experience issue that is orthogonal to the question of 
> how this property should behave.

It wouldn't be orthogonal if the use cannot force reflow-type zooming 
with their personal style sheet, so that would seem (to me) to be a 

Hope this helps, 
Charles Belov 
SFMTA Webmaster 

Received on Thursday, 15 November 2012 00:54:43 UTC

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