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Re: [css4-background] background-position-x and background-position-y or logical directions

From: Florian Rivoal <florianr@opera.com>
Date: Thu, 21 Jun 2012 17:48:33 +0200
To: www-style@w3.org
Message-ID: <op.wf9fi7tt4p7avi@localhost.localdomain>
On Thu, 21 Jun 2012 17:33:41 +0200, Marat Tanalin | tanalin.com
<mtanalin@yandex.ru> wrote:

> 21.06.2012, 18:55, "Florian Rivoal" <florianr@opera.com>:
>> * They can be simulated with variables, so we can live without them:
>>
>> For instance, here is a typical example of how they are used:
>>   .icon { background: url(sprite.png) 0 0 no-repeat; }
>>   #a { background-position-y: 0; }
>>   #b { background-position-y: -30px; }
>>   #c { background-position-y: -60px; }
>>   .icon:hover { background-position-x: -30px; }
>>   .icon:active { background-position-x: -60px; }
>>
>> This can be rewritten with variables:
>>   .icon { background: url(sprite.png) var(bg-x, 0) var(bg-y, 0)  
>> no-repeat;}
>>   #a { var-bg-y: 0; }
>>   #b { var-bg-y: -30px; }
>>   #c { var-bg-y: -60px; }
>>   .icon:hover { var-bg-x: -30px; }
>>   .icon:active { var-bg-x: -60px; }
>
> Cannot say for others, but for me first example is much more clear.
>
> By the way, very important factor is that background-position-x/-y are  
> supported by IE which is the browser that's updated most slowly.  
> Considering Microsoft's current tactics to release new versions of IE  
> solely for new versions of Windows (no IE>8 for Windows XP, no IE>9 for  
> Windows Vista), IE will continue to update slowly and therefore be  
> painful and blocking new features to be widely used in the wild.
>
> So there is huge difference between adding new feature (variables) and  
> reusing existing one (background-position-x/-y) supported in all IE  
> versions. Any non-IE browser will be updated quite quickly, and we could  
> easily start using background-position-x/-y, say, in a year. On the  
> contrary, we will in fact not be able to use variables until they are  
> implemented in IE which updates very slowly unlike any other browser.

If introducing -x and -y didn't prevent us from doing another useful
thing (logical keywords), then yes, we introducing them would be best,
which is why I was considering writing a spec for it. But we can't have
both, and that troubles me.

    - Florian
Received on Thursday, 21 June 2012 15:49:03 GMT

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