"{{{{{1}}}|{{{{{2}}}|}}}}" gives "{{{{{1}}}|{{{{{2}}}|}}}}" [1]
"{{{{{1}}}|{{{{{2}}}|}}}}"
See Help:Expansion demo templates.
{{xpdopopcc|#tag:math|tex number|234}} gives:
"{{#tag:math|{{tex number|234}}}}" gives " 2.34 × 10 2 {\displaystyle 2.34\times 10^{2}} " [2]
"{{#tag:math|{{tex number|234}}}}"