<p>Most video displays have non-square pixels. Standard definition video processing resolutions are 720 by 480 for NTSC and 720 by 576 for PAL though both are 4 by 3 aspect ratio.<br>
You can argue whether tv standards count as modern, but there are a lot out there.</p>
<p><blockquote type="cite">On 21 Nov 2010 16:56, "Robert O'Callahan" <<a href="mailto:robert@ocallahan.org">robert@ocallahan.org</a>> wrote:<br><br><p><font color="#500050">On Mon, Nov 22, 2010 at 1:40 PM, Charles Pritchard <<a href="mailto:chuck@jumis.com">chuck@jumis.com</a>> wrote:</font></p>
<div class="gmail_quote"><p><font color="#500050">><br>> I would point out that the MS proposal has an independent X and Y scaling mechanism.</font></p><div><br>Does anyone know of any modern displays which have different X and Y resolution?<br>
</div><p><font color="#500050"><br>><br>> I believe that dpi ratio is simply set to "2" (or .5... sorry a bit rusty) on the iOS 4 retina ...</font></p></div>There will be cases where zooming doesn't change device-pixel-ratio. Mobile browsers tend to have a "fast" zoom out which doesn't change the layout (mostly), and that might not change device-pixel-ratio. I think that's OK for your use cases as long as device-pixel-ratio reports the ratio as if the page is "zoomed in".<p>
<font color="#500050"><br><br>Rob<br>-- <br>"Now the Bereans were of more noble character than the Thessalonians, for they received th...</font></p></blockquote></p>