W3C home > Mailing lists > Public > www-style@w3.org > August 2007

Re: [Media Queries] aspect ratio

From: Timur Mehrvarz <timur.mehrvarz@web.de>
Date: Tue, 21 Aug 2007 23:55:46 +0200
Message-Id: <C6C47CC4-04B8-48C2-A301-32D0185672B4@web.de>
Cc: Boris Zbarsky <bzbarsky@mit.edu>, www-style@w3.org
To: Håkon Wium Lie <howcome@opera.com>

On 21.08.2007, at 21:32, Håkon Wium Lie wrote:

>>> First, it is argued that the aspect ration of the device isn't that
>>> interesting, one should (instead/also) query the aspect ratio of the
>>> window.
>> So this would mean that when the user resizes the window the UA  
>> would need to
>> check rules in these @media to see whether they've now started  
>> applying, right?
> Your question is also relevant for the "width" and "height" media
> features.
> In Opera, which support "width" and "height" you have to reload the
> document for the changes to take effect. It's certainly possible to
> implement it so that users don't have to press reload, but the use
> case seems slim (except for demo purposes) and the spec doesn't
> require it.

> So, the answer is no -- the UA would not *need* to check these rules
> during the resize, but there is nothing prohibiting it from doing so.

To me, this is a very important issue. I was always convinced, that  
"device-aspect-ratio" (despite it's name) does actually refer to the  
target rendering area. Especially, in an environment, where UA's are  
normally implemented in resizable windows. I realized my mistake only  
a few days back. Therefor, I very much support the introduction of  
"aspect-ratio" as described here:

>   @media screen and (max-aspect-ratio: 1/1) /* portrait or square */
>   @media screen and (min-aspect-ratio: 1/1) /* landscape or square */

But support for this would not be complete, if it does not imply an  
immediate switch of stylesheets, when the user resizes the rendering  
area. (Whenever a new criteria is fulfilled.) Not mandating this,  
would be bad, because this would very often result in amazing  
rendering results, when the wrong stylesheet is being applied to the  
wrong aspect ratio. I don't think users will realize, that a document  
reload, in such a scenario, could actually result in a (much) better  
rendering. Also, in the context of stateful web applications, a  
reload may be a cumbrous thing to ask for.

Btw, here are two very simple examples, of the kind of thing I would  
like to do with "aspect-ratio":


Received on Tuesday, 21 August 2007 21:56:16 UTC

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