How to use macro in html tag

1 
\define href()
<$macrocall $name="datauri" title="image.png" $output="text/plain"/>
\end

\define Fancybox()
<a href=<<href>> >
macro test
</a>
		
\end

<<Fancybox>>

but this doesn’t seem to work, I got this

<a href="<$macrocall $name=&quot;datauri&quot; title=&quot;image.png&quot; $output=&quot;text/plain&quot;/>">
macro test
</a>
2

You can use the wikify widget to render the macrocall and assign its output to a variable.

Or alternatively you can just use text concatenation with filters.

Quick example:


\define imagetobase64()  [{!!text}] [[;base64,]] [{!!type}] [[data:]] :and[reverse[]join[]]

<$let currentTiddler="PerlinLight.jpg">
<a href={{{ [subfilter<imagetobase64>] }}}>test</a>
</$let>