Re: [css3-background] background-size and zero length

On 5/12/10 3:23 AM, Brian Manthos wrote:
> Note that this example doesn't apply directly today because neither Opera nor Firefox appear to support background-size values in the background shorthand no matter what I attempt to throw at them.

Yes, because the syntax for background-size in the shorthand wasn't 
finalized as of when we implemented -moz-background-size.  I doubt we'll 
add it to the shorthand until we switch from -moz-background-size to 
background-size, for that matter.

> But let's assume they support the shorthand-based specification of background-size values in the future.  If Firefox maintains the current behavior for values less than 0.00833333331px, then the treatment of that markup will be the same in the future.
> Namely, IE might see...
> div {
>  background: url( / 0.00833333330px 100px aqua;
>  background-size: 100px 100px; /* override the sizing */
>  height: 100px;
>  width: 100px;
> }
> ... while Firefox would see ...
> div {
>  background-size: 100px 100px; /* irrelevant, no image specified */
>  height: 100px;
>  width: 100px;
> }

Uh.... Why, exactly?  Given your style rules above, Firefox will have a 
specified value of "100px 100px" for background-size and render the 
background at that size.  I don't understand how you came to your 
conclusion; care to explain?

In fact, your rule above would be treated by Firefox exactly as this 
rule would be:

   div {
     background-image: url(;
     background-size: 0.00833333330px 100px;
     background-color: aqua;
     background-size: 100px 100px;
     height: 100px;
     width: 100px;

> Such oddities are the enemy of interoperability.

Yes, but there is no such oddity in this case.


Received on Wednesday, 12 May 2010 13:02:31 UTC