OT: CSS details

[Kenneth Brody]

Quoting Jay R. Ashworth (Fri, 22 Aug 2008 13:33:51 -0400):

> On Fri, Aug 22, 2008 at 10:15:27AM -0700, Tyler wrote:
>> Regarding px: *I* didn't class it that way - the CSS standard does.  A
>> pixel is considered relative in size to the *screen resolution*, not
>> other page elements.  So a pixel on a screen with a resolution of
>> 640x480 will be larger than a screen with a res of 1024x768.
>
> Citation, please?
>
> A pixel is in fact, *physically larger*, if you run the same physical
> screen size at those 2 different resolutions, but I don't think that's
> what you mean...

http://www.w3.org/TR/REC-CSS1-961217#length-units

  These relative units are supported:

   H1 { margin: 0.5em }      /* ems, the height of the element's font */
   H1 { margin: 1ex }        /* x-height, ~ the height of the letter 'x' */
   P  { font-size: 12px }    /* pixels, relative to canvas */

   ...

   Pixel units, as used in the last rule, are relative to the resolution of
   the canvas, i.e. most often a computer display. If the pixel density of
   the output device is very different from that of a typical computer
   display, the UA should rescale pixel values. The suggested reference
   pixel is the visual angle of one pixel on a device with a pixel density
   of 90dpi and a distance from the reader of an arm's length. For a nominal
   arm's length of 28 inches, the visual angle is about 0.0227 degrees.

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