If the published output is a HTML report, you can insert HTML markup, that is only visible in this kind of output.
## # <html> # <table style="border:1px solid black;"> # <tr><td>1</td><td>2</td></tr> # <tr><td>3</td><td>3</td></tr> # </html>
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/HTML-Markup.html