Template:Demo of attempt to use parameters within TeX

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Attempt to use template parameters within <math>...</math>:

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "http://localhost:6011/meta.wikimedia.org/v1/":): {\displaystyle {{#expr:2+3}}}

Compare using "#tag:math":

Failed to parse (syntax error): {\displaystyle '"`UNIQ--templatestyles-00000006-QINU`"'<code class="nowrap">&#123;&#123;{{{1}}}&#125;&#125;</code> tc}

For a={{{1}}}, Expression error: Unrecognized punctuation character "{".

{{{1}}}Expression error: Unrecognized punctuation character "{".