Re: set <bg-size> in 'background' shorthand property, syntax of forward slash '/'

On Jan 20, 2011, at 7:36 AM, <tao.yu@nokia.com> <tao.yu@nokia.com> wrote:

> Hi,
>  
> I was looking at the CSS3 Backgrounds & Borders spec for ‘background’ shorthand property. The <bg-layer> syntax is:
>  
> <bg-layer> = <bg-image> || <bg-position> [/ <bg-size>]? || <repeat-style> || <attachment> || <box>{1,2}
>  
> My question here is: if <bg-size> is specified (via a forward slash ‘/’), should it follow a valid <bg-position> immediately?
>  
> Two examples (Example XV & XVI) in spec NOT set <bg-size> after <bg-position> immediately, like Example XVI:
> E { background: #CCC top left url("metal.jpg") / 100% auto no-repeat}
> Is this correct?
>  
> Thanks,
> -Tao

The <bg-position> is required if you specify <bg-size> in the shorthand. This was a big argument for a while, and was resolved in the April 2010 face-to-face meeting:

fantasai: Disallow "/size position", definitely.
fantasai: Allow "position url /size" and "/size url position"?
fantasai: Or restrict it to *only* "position/size"?
RESOLVED: Change background shorthand to have "<bg-position> [/ <bg-size>]".
           (Position is required if you specify size.)

http://lists.w3.org/Archives/Public/www-style/2010Apr/0273.html

So, based on all that, it looks like "position url /size" is not allowed, and the examples do need updating.