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${\displaystyle 1}$ ${\displaystyle E=mc^{2}}$ ${\displaystyle {\cal {x}}}$ \sum_{i=0}^\infty \frac1{2^i}=2 ^[1]

bug 35190

${\displaystyle {\begin{array}{|c|c||c|}a&b&S\\\hline 0&0&1\\0&1&1\\1&0&1\\1&1&0\\\end{array}}}$

bug 36534

${\displaystyle K^{\operatorname {op} }}$

bug 34921

Failed to parse (unknown function "\ndres"): {\displaystyle \ndres} ${\displaystyle {\ce {H2O}}}$

c&p demo

${\displaystyle \left(\sin(x)\right)^{2}+\left(\cos(x)\right)^{2}=\sin ^{2}x+\cos ^{2}x=1}$

\mu _{G} (x) = \mathop \vee \limits_{\alpha :x \in \Phi _\alpha \left( {A_\alpha ^1 , \cdots ,A_\alpha ^n } \right)_\alpha } \alpha

mhchem depr

${\displaystyle {\ce {\log }}//2019-06-06}$

$${\displaystyle \land \lor \mathbb {C} \mathbb {H} }$$

${\displaystyle \%}$

https://phabricator.wikimedia.org/T185033

• ${\displaystyle {\ce {Fe^{2+}+ H2O -> X\\2019-06-06}}}$ renders wrongly. It seems to me that X^{2+} is detected as "unusual" and the fallback logic (omitting all spaces) is applied.
• ${\displaystyle {\ce {Fe^2+ + H2O -> X\\2019-06-06}}}$ works fine. I double checked, X^{2+} is definitely covered by the strict simplified mhchem grammar.