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

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