define-configuration-property name="BLA" is-multi-valued="false" /> 
<set-configuration-property name="BLA" value="true" /> 

@if (BLA) {
  html {background-color: #FF00FF;}
}

This feature has been implemented after GWT 2.7 and will be available in 
GWT 2.8. We should modify the documentation to reflect that. Sorry for the 
confusion.


> Any idea this will be supported in the future ? (or maybe already planned)
If you are talking about:

@def BLA1 is("browser.engine",  "webkit");
@if (BLA1) {
    ... some styles {
}

I don't think this feature will be implemented one day. The reason is 
simple: you can use conditional to define value of a constants, so 
conditional cannot depend of a constant. (or in other words: conditionals 
are evaluated before evaluating the constants)

Julien


On Thursday, April 16, 2015 at 4:24:15 PM UTC+2, Ed wrote:
>
> > Seems like you have to stick with @if(is("browser.engine", "webkit")) 
> then.​
> Thanks Jens. I was afraid of that.
> Any idea this will be supported in the future ? (or maybe already planned)
>

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