<p></p>
<p>To make the conclusion I'm trying to convey clearer, no it can't be <strong>anything</strong>!!!</p>
<p>It can't be anything that Geany/Lexilla/another plugin uses, like changing the text colour to match the value, that would need a lot of styles since each colour would need its own, and a large CSS might run you out of styles (max 255 less already used).  But also Geany and the lexer will simply re-write the style when its re-run on that piece of text.</p>
<p>If no build errors are used by the filetype <a href="https://www.scintilla.org/ScintillaDoc.html#Indicators" rel="nofollow">Indicators</a> are available AFAIK, and <a href="https://www.scintilla.org/ScintillaDoc.html#Annotations" rel="nofollow">annotations</a> are not used anywhere so thats what the OP has to choose from.</p>

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