- From: Christoph Päper <christoph.paeper@crissov.de>
- Date: Tue, 20 Dec 2011 11:01:10 +0100
- To: www-style list <www-style@w3.org>
Tab Atkins Jr.:
> On Sat, Dec 10, 2011 at 4:36 AM, Christoph Päper
>>
>> … the device and display width and height queries would work just fine with physical units (…) if they’re not affected by the fixed 96px = 72pt (…) ratio required elsewhere (…).
>
> They work the same, with the fixed ratio. Anything else would be *ridiculously* confusing.
Here’s a popular example, Apple’s 3:2 “3½ inch” mobile screens:
w h A d
phys. 50mm × 75mm = 38cm² ⇒ 90mm = 3.5in
x y r q
old 320dot × 480dot ⇒ 163dot/in ⇒ [1.7dot/px] = …
new 640dot × 960dot ⇒ 326dot/in ⇒ [3.4dot/px] = …
CSS 96px/in ↗
q’ a b w’ h’ A’ d’
old 2dot/px ⇒ 160px × 240px ⇒ 42mm × 64mm = 27cm² ⇒ 3in
new 3dot/px ⇒ 213px × 320px ⇒ 56mm × 85mm = 48cm² ⇒ 4in
How is it less confusing that, if iOS Webkit applies CSS rules correctly, the same physical screen dimensions can vary that much when queried via CSS “physical” units?
48/38 = 127% 38/48 = 78% 4/3.5 = 114% 3.5/4 = 88%
27/38 = 72% 38/27 = 140% 3/3.5 = 86% 3.5/3 = 117%
27/48 = 56% 48/27 = 178% 3/4 = 75% 4/3 = 133%
Received on Tuesday, 20 December 2011 10:13:41 UTC