[whatwg] <link rel=icon width="" height="">

[Maciej Stachowiak]

On Apr 29, 2008, at 11:17 PM, Jeff Walden wrote:

> Ian Hickson wrote:
>>> This is a proposal to add "height" and "width" attributes to <link>
>>> specifically for the case of rel=icon, so that authors can provide
>>> multiple icons and let the UA decide which to use based on their  
>>> size
>>> (without having to download them all to find out which is best).
>>>
>>> Opinions?
>
> Given that <link/> is more intended as a generic element, I'm  
> somewhat leery of adding attributes specifically for one individual  
> use of it.  If you're going to add an attribute (but see below), I  
> think it makes sense that it be something that any use of <link/>  
> could use to store extra data -- so an opaque attribute whose  
> semantics are specified by the rel attribute of the link.
>
>
> Maciej Stachowiak wrote:
>> I would suggest a sizes attribute which can take a list of sizes  
>> (with x as a width/height separator), or a keyword such as "any" or  
>> "scalable" to indicate a scalable format suitable for any size.
>> <link type="icon" type="application/svg" sizes="any"  
>> href="whatwg.svg">
>> <link type="icon" type="image/microsoft.vnd.icon" sizes="16x16  
>> 32x32" href="whatwg.ico">
>> <link type="icon" type="image/x-apple-icons" sizes="16x16 32x32  
>> 64x64 128x128 256x256 512x512" href="whatwg.icns">
>> <link type="icon" type="image/png" sizes="59x60" href="whatwg.png">
>
> This might require that existing browsers cope correctly (or exploit  
> duplication/error behaviors), but could a MIME parameter address  
> this without needing another attribute at all?  That's the most  
> narrowly scoped change I can imagine that would address the need.
>
>> <link rel="icon" type="application/svg; sizes=any" href="whatwg.svg">
>> <link rel="icon" type='image/microsoft.vnd.icon;  
>> sizes="16x16,32x32"' href="whatwg.ico">
>> <link rel="icon" type='image/x-apple-icons;  
>> sizes="16x16,32x32,64x64,128x128,256x256,512x512"'  
>> href="whatwg.icns">
>> <link rel="icon" type="image/png; sizes=59x60" href="whatwg.png">
>
> Restrictions on what a parameter value may be (basically can't  
> contain any separators or whitespace) are a touch confounding here  
> because you don't have any separators unless you quote; that  
> probably factors into the equation here.

I'm not against using a MIME parameter per se, but it would have to be  
x-prefixed (unless we register it) and I'd strongly prefer a syntax  
that does not require use of nested quotes.

Regards,
Maciej