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Re: Behavior of device-pixel-ratio under zoom

From: Rune Lillesveen <rune@opera.com>
Date: Tue, 13 Nov 2012 00:36:32 +0100
To: www-style@w3.org
Message-ID: <op.wnoo661n8isf1p@id-c1005.oslo.osa>
On Mon, 12 Nov 2012 15:28:00 +0100, Jonathan Kew <jfkthame@googlemail.com>  

> On 12/11/12 01:21, Rune Lillesveen wrote:
>>     For years Firefox has supported a zoom mode that does relayout the
>>     page (by changing the viewport size in CSS pixels). I believe Safari
>>     has supported something similar.
>>     I'm asking whether *that* kind of zoom should affect
>>     devicePixelRatio and device-pixel-ratio.
>> Yes, I think so.
> AFAICT, it doesn't do so in Opera at the moment (12.10, Build 1652, Mac  
> OS X). I made a simple test page[1] to experiment with zooming, and  
> Opera resolutely insists it has a ratio of 2.0 (on a Retina display),  
> regardless of the zoom level.

Which is a bug, I think. Looks like we only took Opera Mobile into  
consideration when implementing that property.

> However, an article[2] several months ago noted that "Turns out Opera's  
> value depends on the zoom level." I was unable to reproduce this, which  
> caused me to wonder whether there has been a change to the behavior,  
> whereby it used to depend on zoom, but no longer does so?

It doesn't say if this is Opera Desktop, Opera Mobile, or which version. I  
don't know.

> [1] http://people.mozilla.org/~jkew/res/test.html
> [2] http://www.quirksmode.org/blog/archives/2012/07/more_about_devi.html

Rune Lillesveen
Received on Monday, 12 November 2012 23:36:55 UTC

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