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Re: [css3-mediaqueries] Is 'resolution' in terms of device pixels or CSS pixels?

From: Brad Kemper <brkemper@comcast.net>
Date: Mon, 7 Apr 2008 09:28:32 -0700
Cc: "L. David Baron" <dbaron@dbaron.org>, www-style@w3.org
Message-Id: <7F8B06BF-C2C9-4412-A8C3-E3F14D5A6DC7@comcast.net>
To: "Anne van Kesteren" <annevk@opera.com>

On Apr 7, 2008, at 8:05 AM, Anne van Kesteren wrote:

> On Mon, 07 Apr 2008 17:00:08 +0200, Brad Kemper  
> <brkemper@comcast.net> wrote:
>> It does make sense to keep it if you think about something like an  
>> iPhone, that has high resolution and a width of 480 device pixels.  
>> On something like that, because the resolution is so high, I'm  
>> going to want to use fairly large font sizes, so that you don't  
>> have to squint to read it. But on something else, like a 72 dpi  
>> monitor, I might want to use smaller font sizes instead, since the  
>> pixels will be larger, and therefore the text will appear larger.  
>> By using smaller text on a low res monitor, I can fit more on the  
>> screen, and it does not appear to be that small because the pixels  
>> are all huge.
> You actually want the proprietary -webkit-device-pixel-ratio for  
> that, not resolution.

I don't think so. From what Hyatt wrote in Surfing Safari about - 
device-pixel-ratio, that feature is used for when you want to specify  
different rules for when the screen is zoomed.[1] What I am talking  
about is specifying different rules for high-density displays for a  
display of a given number of pixels across and down that what you  
would give for a low-density display of the same number of pixels.

The spec for MQ specifically gives examples for the resolution of  
print devices, with examples "300pdi" and "118dpcm". [2] Surely that  
is device pixels.

[1] http://webkit.org/blog/55/high-dpi-web-sites/
[1] http://www.w3.org/TR/2007/CR-css3-mediaqueries-20070606/#resolution
Received on Monday, 7 April 2008 16:29:58 UTC

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