- From: Peter Moulder <pjrm@mail.internode.on.net>
- Date: Mon, 20 Jan 2014 20:04:09 +1100
- To: www-style@w3.org
On Fri, Jan 17, 2014 at 08:51:28AM -0800, Tab Atkins Jr. wrote: > Please reread <http://dev.w3.org/csswg/css-values/#absolute-lengths>. > The 'px' unit is an absolute unit, defined to have a 96:1 ratio with > the 'in' unit (and thus a 4:3 ratio with the 'pt' unit). It has > nothing to do with device pixels, which is what is measured by DPI. That last sentence is going too far: as has already been pointed out in this thread, it does indeed have something to do with device pixels. From the cited document: # For such devices [i.e. of low resolution, or with an unusual viewing # distance] it is recommended that the pixel unit refer to the whole number # of device pixels that best approximates the reference pixel. Thus, while the CSS <length> 16px is equal to the CSS <length> 12pt, it is not necessarily equal to 12 pt, and (more importantly) is not necessarily the best available approximation of either 16 reference px or of a comfortable reading size. That said, a note along the lines that John Daggett suggested sounds reasonable. pjrm.
Received on Monday, 20 January 2014 09:04:30 UTC