RA,

See if this works for you:
\define myhelper(h) <span style="color:$h$"/>
\define mymacro(c:"variable_for_color") <$macrocall $name="myhelper" h=<<$c$
>>/>

<$set name="variable_for_color" value="blue">
a <<mymacro>> b
</$set>

Inspecting the underlying HTML gives:
<p>
a <span style="color:blue"></span> b

</p>

Cheers


On Sunday, March 31, 2019 at 10:59:26 AM UTC+7, RA wrote:
>
> Is it possible? I want to do something like this:
>
> \define mymacro(c:variable_for_color)   <span style=
> "color:variable_for_color"/>
>
> So, there are 3 questions here really: defining a variable before defining 
> a macro, using variable as a macro parameter default, and using variable 
> inside html tag.
>

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