Template:mathjax-or
From cppreference.com
Template documentation
Usage: {{mathjax-or|1=X|2=Y}}.
When MathJax is available via the gadget, displays X. Otherwise, displays Y as if it is wrapped in {{math}}.
Example:
{{mathjax-or|1=\(\binom{k + i - 1}{i}\)|2={{mparen|(|)|k + i − 1|i}}}}
produces the text \(\binom{k + i - 1}{i}\) if the gadget is enabled, which is then rendered by MathJax .
Otherwise, it produces the fallback: ⎛
⎜
⎝k + i − 1
i⎞
⎟
⎠
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