W3C home > Mailing lists > Public > www-style@w3.org > August 2009

Re: Gradient syntax proposal

From: Brad Kemper <brad.kemper@gmail.com>
Date: Fri, 14 Aug 2009 14:57:40 -0700
Message-Id: <B257CC4E-2621-47DF-90D9-0D944DA5E391@gmail.com>
To: fantasai <fantasai.lists@inkedblade.net>
Cc: "www-style@w3.org" <www-style@w3.org>


On Aug 14, 2009, at 1:47 PM, fantasai <fantasai.lists@inkedblade.net>  
wrote:

> Brad Kemper wrote:
>> On Aug 13, 2009, at 4:35 PM, Tab Atkins Jr. wrote:
>>> Just linear gradients for now:
>>>
>>> http://www.xanthir.com/document/document.php? 
>>> id= 
>>> d65df9d10442ef96c2dfe5e1d7bbebf7aa42f2bcf24e68fc3777c4b484fa8a4ce55fed2189cac20ccad8686127f4c08917c4ca8b7614e9f89c2a950ec083a9c6
 

>>>
>>> ~TJ
>>>
>> I won't get into my objections to [inner | outer] right now, but  
>> about the rest of this:
>
> We could make the default 'outer', which should address your  
> concerns, no?

If others really think this is necessary and are willing to add this  
extra complexity, yes.

> I'd use the keywords 'inside' and 'outside', btw. I think they fit  
> better,
> and also they're already in the parsing system (for list-style- 
> position).
>
>> One of the things I really hate about using "<bg-position>, <bg- 
>> position>" is that comma to separate the two lengths or keywords on  
>> the left from those on the right. Since commas are already being  
>> used to separate color-stops, this just makes the whole thing  
>> harder to read, because they are no longer used consistently to  
>> group like things. When they are used only for color-stops, then  
>> you can see in a glance how many color-stops there are instead of  
>> having to study it more closely with a line full of distances and  
>> commas. For instance, I find the following very hard to read, and  
>> it probably doesn't even make sense (which is another problem with  
>> this kind of construction). |linear-gradient(10px 30%, 100% 4%, 50%  
>> green, 20% blue)|
>
> I completely agree. How about using a keyword?
>
>  linear-gradient(10px 30% to 100% 4%, green, blue 20%, navy);

Do you really think people will really need to start on such a precise  
xy point instead of just some distance or percentage from the corner?  
I don't, but maybe calc() can be used to figure that distance from the  
corner.

If I wanted to start say, 30% from the top, and end at the bottom, I  
would write that as "linear-gradient(top, green 30%, blue 20%, navy)".  
Or if I wanted to be a few degrees off from straight down, I would do  
"linear-gradient(-87deg, green 30%, blue 20%, navy)". I think these  
are both much cleaner, and provide all that an author will really need.

No semicolon at the end BTW.


> For simpler cases you'd get
>
>  linear-gradient(left to right, green, blue, navy);

You don't need the "to right" because that is the direction you would  
go from left without an angle. Wherever you start, just head to the  
opposite side or corner.

> We could also use some other punctuation instead of that first  
> comma, e.g.
>
>  linear-gradient(10px 30% to 100% 4% / green, blue 20%, navy);
>  linear-gradient(left to right / green, blue, navy);
>
> But it's not really necessary. The comma could even be dropped if we
> forbid the first percentage.
>
>  /* This is ok and parseable */
>  linear-gradient(left to right green, 50% blue, 100% navy);

That's very close to what I suggested, except for the "to right" part

> /* Invalid b/c ambiguous with 'right 0%' position syntax*/
>  linear-gradient(left to right 0% green, 50% blue, 100% navy);
>
> ~fantasai
>
>
Received on Friday, 14 August 2009 21:58:36 GMT

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