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Re: Should implementors copy vendor prefixes from each other?

From: Ph. Wittenbergh <jk7r-obt@asahi-net.or.jp>
Date: Fri, 15 May 2009 15:05:39 +0900
Cc: "L. David Baron" <dbaron@dbaron.org>, www-style@w3.org
Message-Id: <EA188ECA-9F07-415B-ADC5-7144B1FF7182@asahi-net.or.jp>
To: Daniel Glazman <daniel.glazman@disruptive-innovations.com>

On May 15, 2009, at 2:41 PM, Daniel Glazman wrote:

> L. David Baron wrote:
>> When implementors are implementing experimental properties that have
>> already been implemented by other vendors, should they copy vendor
>> prefixes from each other, or not?
>> For example, if Mozilla is implementing the 'transition-delay'
>> property [1], which is already implemented in WebKit as
>> '-webkit-transition-delay', should it implement it as
>> '-moz-transition-delay' (the approach we've taken so far) or
>> '-webkit-transition-delay'?
> It's a complex but very good question. Let me push it to the
> limits: if Mozilla implements -webkit-* properties, I don't
> understand why prefixes exist at all. BTW, a third option
> for your case above is -moz-webkit-transition-delay. I'm not
> saying it's not crazy but it's logical...
> But let's go back to your question.
> On one hand, prefixes are used the following ways:
>  1. experimental properties that are not fully conformant to the spec
>  2. proprietary properties
> In the second case, if Mozilla starts implementing an Apple  
> proprietary
> property for instance, then the property should probably be  
> standardized
> and at some point in the future you'll want the -moz-* version.
> In the first case, browser vendors use prefixes until they're sure  
> their
> implementations is conformant to the spec. This is a positive and a  
> very
> bad thing at the same time. I have seen so many style sheets on the  
> Web
> these days with
>  -moz-border-radius: 5px;
>  -webkit-border-radius: 5px;
>  border-radius: 5px;
> Am I the only one here to find that totally crazy?

yes, it is a little crazy at times. But then. Different vendor  
implement things at different times, based on the most recent draft of  
a given spec.
Take the example of border-radius.
The shorthand example above is pretty easy. But try to use the long  
hand version

	-webkit-border-top-left-radius: 10px;
	-moz-border-radius-topleft:10px; /* based on some old draft */


	-moz-border-radius: 10px 3px 10px 3px;
	-webkit-border-radius: 10px 3px 10px 3px; /* but this doesn't work -  
broken or not implemented*/

Or take the box-shadow property. Gecko 1.9.1 implements what is in the  
current draft; WebKit doesn't support the 'inset' keyword, nor the  
'offset value.

As an author, I prefer separate vendor prefixes, even if it is a  
little crazy, and a little confusing - and some  bloat in the  

Philippe Wittenbergh
Received on Friday, 15 May 2009 06:06:22 UTC

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