Not sure what the "set" was supposed to be doing. If I understand what you 
want, this seems to work:

\whitespace trim
    <span style={{{ [{!!color}addprefix[background-color: ]] }}} >
    <<currentTiddler>>
    </span>



On Thursday, February 20, 2020 at 2:06:44 PM UTC-8, T. E. Sanders wrote:
>
> Hey all, I'm trying to write a template. It works as a template in that it 
> renders the currentTiddler, but if I try to use the color from the tiddler 
> on the background, it doesn't evaluate and simply renders the text as-is.
>
> For example
> \whitespace trim
> \define col() {{!!color}}
> <$set name="transclusion" value=<<currentTiddler>>>
>     <span style="background-color:<<col>>" >
>     <<currentTiddler>>
>     </span>
> </$set>
>
> doesn't work. Neither did style="background-color:{{!!color}}" and it 
> doesn't matter if I use quotes or not. Clearly I'm missing some syntax or 
> something.
> The goal is just to make the background the color set in the color field. 
> Ideas?
>

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