Extension:Math/Native MathML/Reported Cases

Reported cases.

Vesion on Beta has development version, some cases may render correctly there, but not here https://en.wikipedia.beta.wmflabs.org/wiki/Extension:Math/Native_MathML/Reported_Cases

See Extension:Math/Native_MathML/Operators for complete set of operators

See Extension:Math/Native_MathML/Chemistry for problem with chemical formula.

Cases 1-9

Reported Phabricator bugs

Number	LaTex	Rendering	Notes
1a T377057 open	\text{let}\ {n \to +\infty}	$\text{let}n\to +\mathrm{\infty }$ $\text{let}n\to +\mathrm{\infty }$ ${\text{let}}\ {n\to +\infty }$	Too much space around operators when used in limits in MathML mode. Spaces should appear in normal mode,
1b	\lim_{n\to +\infty}\left(1+\frac 1n\right)^n	$\underset{n\to +\mathrm{\infty }}{lim}{(1+\frac{1}{n})}^n$ $\underset{n\to +\mathrm{\infty }}{lim}{(1+\frac{1}{n})}^n$ $\lim _{n\to +\infty }\left(1+{\frac {1}{n}}\right)^{n}$	Spaces should not appear in a limit
2 T375935 Done	\lim_{n \to +\infty}\frac{\sqrt{2\pi n} }{n!}\left(\frac{n}{e}\right)^n = 1	$\underset{n\to +\mathrm{\infty }}{lim}\frac{\sqrt{2\pi n}}{n!}{\left(\frac{n}{e}\right)}^n=1$ $\underset{n\to +\mathrm{\infty }}{lim}\frac{\sqrt{2\pi n}}{n!}{\left(\frac{n}{e}\right)}^n=1$ $\lim _{n\to +\infty }{\frac {\sqrt {2\pi n}}{n!}}\left({\frac {n}{e}}\right)^{n}=1$	The factorial symbol ! should be upright, it is sloping in Clients-side mathjax mode.
3 T375907 Done	\det(A)=\sum_{\sigma\in S_n} e(\sigma)\prod_{i=1}^n a_{i,\sigma_i}	$det(A)=\sum _{\sigma \in S_n}e(\sigma )\prod _{i=1}^n{a}_{i,{\sigma }_i}$ $det(A)=\sum _{\sigma \in S_n}e(\sigma )\prod _{i=1}^n{a}_{i,{\sigma }_i}$ $\det(A)=\sum _{\sigma \in S_{n}}e(\sigma )\prod _{i=1}^{n}a_{i,\sigma _{i}}$	\sum_condition puts condition in the in wrong position in MathML and client-side MathJax modes
4a T375349 Done	\textstyle \int\limits_{-N}^{N} e^x dx	$\underset{-N}{\overset{N}{\int }}{e}^{x}dx$ $\underset{-N}{\overset{N}{\int }}{e}^{x}dx$ $\textstyle \int \limits _{-N}^{N}e^{x}dx$	\int_a^b limits in incorrect position in MathML mode.
4b Done	\textstyle \int_{-N}^{N} e^x dx	${\int }_{-N}^N{e}^{x}dx$ ${\int }_{-N}^N{e}^{x}dx$ $\textstyle \int _{-N}^{N}e^{x}dx$
4c Done	\displaystyle \int\limits_{-N}^{N} e^x dx	$\underset{-N}{\overset{N}{\int }}{e}^{x}dx$ $\underset{-N}{\overset{N}{\int }}{e}^{x}dx$ $\displaystyle \int \limits _{-N}^{N}e^{x}dx$
4d	\displaystyle \int_{-N}^{N} e^x dx	${\int }_{-N}^N{e}^{x}dx$ ${\int }_{-N}^N{e}^{x}dx$ $\displaystyle \int _{-N}^{N}e^{x}dx$
4e Done	\int\limits_{1}^{3}\frac{e^3/x}{x^2}\, dx	$\underset{1}{\overset{3}{\int }}\frac{e^3/x}{x^2}dx$ $\underset{1}{\overset{3}{\int }}\frac{e^3/x}{x^2}dx$ $\int \limits _{1}^{3}{\frac {e^{3}/x}{x^{2}}}\,dx$
4f	\int_{1}^{3}\frac{e^3/x}{x^2}\, dx	${\int }_1^3\frac{e^3/x}{x^2}dx$ ${\int }_1^3\frac{e^3/x}{x^2}dx$ $\int _{1}^{3}{\frac {e^{3}/x}{x^{2}}}\,dx$
4h Done	\int\limits_{1}^{3}\frac{\frac{e^3}{x} }{\frac{x^2}{5} }\, dx	$\underset{1}{\overset{3}{\int }}\frac{\frac{e^3}{x}}{\frac{x^2}{5}}dx$ $\underset{1}{\overset{3}{\int }}\frac{\frac{e^3}{x}}{\frac{x^2}{5}}dx$ $\int \limits _{1}^{3}{\frac {\frac {e^{3}}{x}}{\frac {x^{2}}{5}}}\,dx$
4i	\int_{1}^{3}\frac{\frac{e^3}{x} }{\frac{x^2}{5} }\, dx	${\int }_1^3\frac{\frac{e^3}{x}}{\frac{x^2}{5}}dx$ ${\int }_1^3\frac{\frac{e^3}{x}}{\frac{x^2}{5}}dx$ $\int _{1}^{3}{\frac {\frac {e^{3}}{x}}{\frac {x^{2}}{5}}}\,dx$
5a T375317 Done Works on beta	\begin{align} \frac{dy}{du} &= f'(u) = e^u, \\ \frac{du}{dv} &= g'(v) = \cos v, \\ \frac{dv}{dx} &= h'(x) = 2x. \end{align}	$\begin{array}{cc}\frac{dy}{du}& =f^{\prime }(u)=e^u,\\ \frac{du}{dv}& =g^{\prime }(v)=\cos v,\\ \frac{dv}{dx}& =h^{\prime }(x)=2x.\end{array}$ $\begin{array}{cc}\frac{dy}{du}& =f^{\prime }(u)=e^u,\\ \frac{du}{dv}& =g^{\prime }(v)=\cos v,\\ \frac{dv}{dx}& =h^{\prime }(x)=2x.\end{array}$ ${\begin{aligned}{\frac {dy}{du}}&=f'(u)=e^{u},\\{\frac {du}{dv}}&=g'(v)=\cos v,\\{\frac {dv}{dx}}&=h'(x)=2x.\end{aligned}}$	\align aligns fields in the centre rather that on the left in MathML mode
5b	\begin{align} z & = a \\ f(x,y,z) & = x + y + z \end{align}	$\begin{array}{cc}z& =a\\ f(x,y,z)& =x+y+z\end{array}$ $\begin{array}{cc}z& =a\\ f(x,y,z)& =x+y+z\end{array}$ ${\begin{aligned}z&=a\\f(x,y,z)&=x+y+z\end{aligned}}$
5c Done	f(n) = \begin{cases} n/2, & \text{if }n\text{ is even} \\ 3n+1, & \text{if }n\text{ is odd} \end{cases}	$f(n)=\{\begin{array}{cc}n/2,& \text{if }n\text{ is even}\\ 3n+1,& \text{if }n\text{ is odd}\end{array}$ $f(n)=\{\begin{array}{cc}n/2,& \text{if }n\text{ is even}\\ 3n+1,& \text{if }n\text{ is odd}\end{array}$ $f(n)={\begin{cases}n/2,&{\text{if }}n{\text{ is even}}\\3n+1,&{\text{if }}n{\text{ is odd}}\end{cases}}$
5d Done	\begin{align} a&=b & c&=d & e&=f\\ aa&=bb & cc&=dd & ee&=ff\\ aaa&=bbb & ccc&=ddd & eee&=fff \end{align}	$\begin{array}{cccccc}a& =b& c& =d& e& =f\\ aa& =bb& cc& =dd& ee& =ff\\ aaa& =bbb& ccc& =ddd& eee& =fff\end{array}$ $\begin{array}{cccccc}a& =b& c& =d& e& =f\\ aa& =bb& cc& =dd& ee& =ff\\ aaa& =bbb& ccc& =ddd& eee& =fff\end{array}$ ${\begin{aligned}a&=b&c&=d&e&=f\\aa&=bb&cc&=dd&ee&=ff\\aaa&=bbb&ccc&=ddd&eee&=fff\end{aligned}}$
5e	\begin{align} x&=y & X&=Y & a&=b+c\\ x'&=y' & X'&=Y' & a'&=b\\ x+x'&=y+y' & X+X'&=Y+Y' & a'b&=c'b \end{align}	$\begin{array}{cccccc}x& =y& X& =Y& a& =b+c\\ x^{\prime }& =y^{\prime }& X^{\prime }& =Y^{\prime }& a^{\prime }& =b\\ x+x^{\prime }& =y+y^{\prime }& X+X^{\prime }& =Y+Y^{\prime }& a^{\prime }b& =c^{\prime }b\end{array}$ $\begin{array}{cccccc}x& =y& X& =Y& a& =b+c\\ x^{\prime }& =y^{\prime }& X^{\prime }& =Y^{\prime }& a^{\prime }& =b\\ x+x^{\prime }& =y+y^{\prime }& X+X^{\prime }& =Y+Y^{\prime }& a^{\prime }b& =c^{\prime }b\end{array}$ ${\begin{aligned}x&=y&X&=Y&a&=b+c\\x'&=y'&X'&=Y'&a'&=b\\x+x'&=y+y'&X+X'&=Y+Y'&a'b&=c'b\end{aligned}}$
6a T375295 Done	\begin{align} \frac{dy}{du} &= f'(u) = e^u, \\[6pt] \frac{du}{dv} &= g'(v) = \cos v, \\[6pt] \frac{dv}{dx} &= h'(x) = 2x. \end{align}	$\begin{array}{cc}\frac{dy}{du}& =f^{\prime }(u)=e^u,\\ \frac{du}{dv}& =g^{\prime }(v)=\cos v,\\ \frac{dv}{dx}& =h^{\prime }(x)=2x.\end{array}$ $\begin{array}{cc}\frac{dy}{du}& =f^{\prime }(u)=e^u,\\ \frac{du}{dv}& =g^{\prime }(v)=\cos v,\\ \frac{dv}{dx}& =h^{\prime }(x)=2x.\end{array}$ ${\begin{aligned}{\frac {dy}{du}}&=f'(u)=e^{u},\\[6pt]{\frac {du}{dv}}&=g'(v)=\cos v,\\[6pt]{\frac {dv}{dx}}&=h'(x)=2x.\end{aligned}}$	\begin{align} with font sizes specified show font size annotation [6pt] in MathML mode
6b	\begin{align} \varpi &= [2,1,1,1,1,1,4,1,2,\ldots], \\[8mu] 2\varpi &= [5,4,10,2,1,2,3,29,\ldots], \\[5mu] \frac{\varpi}{2} &= [1,3,4,1,1,1,5,2,\ldots], \\[2mu] \frac{\varpi}{\pi} &= [0,1,5,21,3,4,14,\ldots]. \end{align}	$\begin{array}{cc}\varpi & =[2,1,1,1,1,1,4,1,2,\dots ],\\ 2\varpi & =[5,4,10,2,1,2,3,29,\dots ],\\ \frac{\varpi }{2}& =[1,3,4,1,1,1,5,2,\dots ],\\ \frac{\varpi }{\pi }& =[0,1,5,21,3,4,14,\dots ].\end{array}$ $\begin{array}{cc}\varpi & =[2,1,1,1,1,1,4,1,2,\dots ],\\ 2\varpi & =[5,4,10,2,1,2,3,29,\dots ],\\ \frac{\varpi }{2}& =[1,3,4,1,1,1,5,2,\dots ],\\ \frac{\varpi }{\pi }& =[0,1,5,21,3,4,14,\dots ].\end{array}$ ${\begin{aligned}\varpi &=[2,1,1,1,1,1,4,1,2,\ldots ],\\[8mu]2\varpi &=[5,4,10,2,1,2,3,29,\ldots ],\\[5mu]{\frac {\varpi }{2}}&=[1,3,4,1,1,1,5,2,\ldots ],\\[2mu]{\frac {\varpi }{\pi }}&=[0,1,5,21,3,4,14,\ldots ].\end{aligned}}$
7a T375861 reopened	a\operatorname{sn}b	$a\mathrm{sn}b$ $a\mathrm{sn}b$ $a\operatorname {sn} b$	a\operatorname{sn}b rendered with no spaces before and after operator in MathML mode. Works in Firefox by not Chrome
7b	a(\operatorname{sn}(b)), a[\operatorname{sn}[b]], a\{\operatorname{sn}\{b\}\}	$a(\mathrm{sn}(b)),a[\mathrm{sn}[b]],a\{\mathrm{sn}\{b\}\}$ $a(\mathrm{sn}(b)),a[\mathrm{sn}[b]],a\{\mathrm{sn}\{b\}\}$ $a(\operatorname {sn} (b)),a[\operatorname {sn} [b]],a\{\operatorname {sn} \{b\}\}$	no space need here
7c	\operatorname{G}(V, g)	$\mathrm{G}(V,g)$ $\mathrm{G}(V,g)$ $\operatorname {G} (V,g)$	no space need here
8a T375907 Done	\displaystyle\sum_{n\in\mathbb{Z} }	$\sum _{n\in \mathbb{Z}}$ $\sum _{n\in \mathbb{Z}}$ $\displaystyle \sum _{n\in \mathbb {Z} }$	\sum_condition puts condition in the in wrong position in MathML and client-side MathJax modes
8b	\displaystyle\prod_{n\in\mathbb{Z} }	$\prod _{n\in \mathbb{Z}}$ $\prod _{n\in \mathbb{Z}}$ $\displaystyle \prod _{n\in \mathbb {Z} }$
8b	\displaystyle\prod_{n\in\mathbb{Z} }^{n\ne 5}	$\prod _{n\in \mathbb{Z}}^{n\ne 5}$ $\prod _{n\in \mathbb{Z}}^{n\ne 5}$ $\displaystyle \prod _{n\in \mathbb {Z} }^{n\neq 5}$	with superscript rendered below
8c	\sum_{n>k} R \quad \prod_{n>k} P \quad \coprod_{n>k} RR	$\sum _{n>k}R\prod _{n>k}P\coprod _{n>k}RR$ $\sum _{n>k}R\prod _{n>k}P\coprod _{n>k}RR$ $\sum _{n>k}R\quad \prod _{n>k}P\quad \coprod _{n>k}RR$
8d	\bigcup_{n>k} J \quad \biguplus_{n>k} L \quad \bigcap_{n>k} N	$\bigcup _{n>k}J\underset{n>k}{⨄}L\bigcap _{n>k}N$ $\bigcup _{n>k}J\underset{n>k}{⨄}L\bigcap _{n>k}N$ $\bigcup _{n>k}J\quad \biguplus _{n>k}L\quad \bigcap _{n>k}N$
8e	\bigoplus_{n>k} W \quad \bigotimes_{n>k} V \quad \bigodot_{n>k} F	$\underset{n>k}{⨁}W\underset{n>k}{⨂}V\underset{n>k}{⨀}F$ $\underset{n>k}{⨁}W\underset{n>k}{⨂}V\underset{n>k}{⨀}F$ $\bigoplus _{n>k}W\quad \bigotimes _{n>k}V\quad \bigodot _{n>k}F$
8f	\bigvee_{n>k} V \quad \bigwedge_{n>k} W \quad \bigsqcup_{n>k} S	$\underset{n>k}{\bigvee }V\underset{n>k}{\bigwedge }W\underset{n>k}{⨆}S$ $\underset{n>k}{\bigvee }V\underset{n>k}{\bigwedge }W\underset{n>k}{⨆}S$ $\bigvee _{n>k}V\quad \bigwedge _{n>k}W\quad \bigsqcup _{n>k}S$
8g	\int_{n>k} U \quad \oint_{n>k} T \quad \iint_{n>k} S	${\int }_{n>k}U{\oint }_{n>k}T{\iint }_{n>k}S$ ${\int }_{n>k}U{\oint }_{n>k}T{\iint }_{n>k}S$ $\int _{n>k}U\quad \oint _{n>k}T\quad \iint _{n>k}S$	Default for integrals is to the side
8h	\min_x\ \max_x\ \sup_x\ \inf_x\ \liminf_x	$\underset{x}{min}\underset{x}{max}\underset{x}{sup}\underset{x}{inf}\underset{x}{lim\; inf}$ $\underset{x}{min}\underset{x}{max}\underset{x}{sup}\underset{x}{inf}\underset{x}{lim\; inf}$ $\min _{x}\ \max _{x}\ \sup _{x}\ \inf _{x}\ \liminf _{x}$
8i	\lim_x\ \varliminf_x\ \varlimsup_x\ \varinjlim_x\ \varprojlim_x\ \limsup_x\ \injlim_x\ \projlim_x	$\underset{x}{lim}\underset{x}{\underset{―}{\lim }}\underset{x}{\bar{\lim }}\underset{x}{\underrightarrow{\lim }}\underset{x}{\underleftarrow{\lim }}\underset{x}{lim\; sup}\underset{x}{inj\; lim}\underset{x}{proj\; lim}$ $\underset{x}{lim}\underset{x}{\underset{―}{\lim }}\underset{x}{\bar{\lim }}\underset{x}{\underrightarrow{\lim }}\underset{x}{\underleftarrow{\lim }}\underset{x}{lim\; sup}\underset{x}{inj\; lim}\underset{x}{proj\; lim}$ $\lim _{x}\ \varliminf _{x}\ \varlimsup _{x}\ \varinjlim _{x}\ \varprojlim _{x}\ \limsup _{x}\ \injlim _{x}\ \projlim _{x}$
8j	\det_x\ \gcd_x\ \Pr_x	$\underset{x}{det}\underset{x}{gcd}\underset{x}{Pr}$ $\underset{x}{det}\underset{x}{gcd}\underset{x}{Pr}$ $\det _{x}\ \gcd _{x}\ \Pr _{x}$
9a T375274 Done	\arccot(x), \arccsc(x), \arcsec(x), \sen(x), \sgn(x)	$\mathrm{arccot}(x),\mathrm{arccsc}(x),\mathrm{arcsec}(x),\mathrm{sen}(x),\mathrm{sgn}(x)$ $\mathrm{arccot}(x),\mathrm{arccsc}(x),\mathrm{arcsec}(x),\mathrm{sen}(x),\mathrm{sgn}(x)$ $\operatorname {arccot} (x),\operatorname {arccsc} (x),\operatorname {arcsec} (x),\operatorname {sen} (x),\operatorname {sgn} (x)$	mediawiki_function_names math functions eat the following paren in native MML mode
9b	\arcsin(x), \sin(x)	$\arcsin (x),\sin (x)$ $\arcsin (x),\sin (x)$ $\arcsin(x),\sin(x)$
9c	\operatorname{arccot}(x), \operatorname{arcsin}(x), \operatorname{sgn}(x), \operatorname{sin}(x)	$\mathrm{arccot}(x),\arcsin (x),\mathrm{sgn}(x),\sin (x)$ $\mathrm{arccot}(x),\arcsin (x),\mathrm{sgn}(x),\sin (x)$ $\operatorname {arccot} (x),\operatorname {arcsin} (x),\operatorname {sgn} (x),\operatorname {sin} (x)$

Cases 10-24

Reported Phabricator bugs

10a T375959 Done	\langle \psi | B^b \quad \lbrace \psi | B^b \quad \lbrack \psi | B^b	$⟨\psi |B^b\{\psi |B^b[\psi |B^b$ $⟨\psi |B^b\{\psi |B^b[\psi |B^b$ $\langle \psi |B^{b}\quad \lbrace \psi |B^{b}\quad \lbrack \psi |B^{b}$	Use stretchy="false" for \langle and \rangle in MathML mode
10b	B^b |\psi\rangle \quad B^b | \psi \rbrace \quad B^b | \psi \rbrack \quad B^b \vert\psi\rangle	$B^b|\psi ⟩B^b|\psi \}{B}^b|\psi ]B^b|\psi ⟩$ $B^b|\psi ⟩B^b|\psi \}{B}^b|\psi ]B^b|\psi ⟩$ $B^{b}|\psi \rangle \quad B^{b}|\psi \rbrace \quad B^{b}|\psi \rbrack \quad B^{b}\vert \psi \rangle$
10c	B^b \left|\psi\right\rangle \quad \psi \left|B^b\right\rangle	$B^b|\psi ⟩\psi |B^b⟩$ $B^b|\psi ⟩\psi |B^b⟩$ $B^{b}\left|\psi \right\rangle \quad \psi \left|B^{b}\right\rangle$	Explicitly specifying \left and \right work
10d	B^b |\psi\rangle	$B^b|\psi ⟩$ $B^b|\psi ⟩$ $B^{b}|\psi \rangle$
11a T375960 Partially done	\updownarrow \big\updownarrow \Big\updownarrow \bigg\updownarrow \Bigg\updownarrow \dots \Bigg\Updownarrow \bigg\Updownarrow \Big\Updownarrow \big\Updownarrow \Updownarrow	$\updownarrow \updownarrow \updownarrow \updownarrow \updownarrow \dots \Updownarrow \Updownarrow \Updownarrow \Updownarrow \Updownarrow$ $\updownarrow \updownarrow \updownarrow \updownarrow \updownarrow \dots \Updownarrow \Updownarrow \Updownarrow \Updownarrow \Updownarrow$ $\updownarrow {\big \updownarrow }{\Big \updownarrow }{\bigg \updownarrow }{\Bigg \updownarrow }\dots {\Bigg \Updownarrow }{\bigg \Updownarrow }{\Big \Updownarrow }{\big \Updownarrow }\Updownarrow$	\Big/ and \Big\backslash etc are too small in MathML mode.
11b	/ \big/ \Big/ \bigg/ \Bigg/ \dots \Bigg\backslash \bigg\backslash \Big\backslash \big\backslash \backslash	$/////\dots \backslash \backslash \backslash \backslash \mathrm{\setminus }$ $/////\dots \backslash \backslash \backslash \backslash \mathrm{\setminus }$ $/{\big /}{\Big /}{\bigg /}{\Bigg /}\dots {\Bigg \backslash }{\bigg \backslash }{\Big \backslash }{\big \backslash }\backslash$	Partially works in Firefox, upstream problems in chrome, some have almost zero use case
12a T375974 Done	f:X\to Y	$f:X\to Y$ $f:X\to Y$ $f:X\to Y$	Colon in f : X \to Y should be an operator in MathML mode.
12b	D \And E	$D\mathrm{\&}E$ $D\mathrm{\&}E$ $D\And E$	Has more space in LaTeX
12c	A \smile B \frown B	$A⌣B⌢B$ $A⌣B⌢B$ $A\smile B\frown B$
12d	A \therefore B \because B	$A\therefore B\because B$ $A\therefore B\because B$ $A\therefore B\because B$
12e	B \overset{\underset{\mathrm{def} }{} }{=} B	$B\stackrel{\mathrm{d}\mathrm{e}\mathrm{f}}{=}B$ $B\stackrel{\mathrm{d}\mathrm{e}\mathrm{f}}{=}B$ $B{\overset {\underset {\mathrm {def} }{}}{=}}B$
12f	A \ulcorner B \urcorner B \llcorner B \lrcorner C	$A⌜B⌝B⌞B⌟C$ $A⌜B⌝B⌞B⌟C$ $A\ulcorner B\urcorner B\llcorner B\lrcorner C$
12g	A \blacktriangle B \blacktriangledown B	$A▴B▾B$ $A▴B▾B$ $A\blacktriangle B\blacktriangledown B$
12h	\forall(\ulcorner\phi\urcorner\in\Sigma^0_n\cup\Pi^0_n) \implies\mathrm{Tr}_n(\ulcorner\phi(y_0,\ldots,y_n)^*\urcorner))	$\mathrm{\forall }(⌜\varphi ⌝\in {\Sigma }_n^0\cup {\Pi }_n^0)⟹{\mathrm{T}\mathrm{r}}_n(⌜\varphi (y_0,\dots ,y_n{)}^{\ast }⌝))$ $\mathrm{\forall }(⌜\varphi ⌝\in {\Sigma }_n^0\cup {\Pi }_n^0)⟹{\mathrm{T}\mathrm{r}}_n(⌜\varphi (y_0,\dots ,y_n{)}^{\ast }⌝))$ $\forall (\ulcorner \phi \urcorner \in \Sigma _{n}^{0}\cup \Pi _{n}^{0})\implies \mathrm {Tr} _{n}(\ulcorner \phi (y_{0},\ldots ,y_{n})^{*}\urcorner ))$	en:Reflection principle
13 T376546 Done	\|A\|, D(p\|q)	$\Vert A\Vert ,D(p\Vert q)$ $\Vert A\Vert ,D(p\Vert q)$ $\|A\|,D(p\|q)$	\| should render as a double pipe || rather than a single one |. In MathML and Client-side MathJax modes.
14 T376558 Done	q(v)=|v|^2\quad q(v)=\|v\|^2 \quad q(v)=\|v\|_A	$q(v)=|v{|}^{2}q(v)=\Vert v{\Vert }^{2}q(v)=\Vert v{\Vert }_A$ $q(v)=|v{|}^{2}q(v)=\Vert v{\Vert }^{2}q(v)=\Vert v{\Vert }_A$ $q(v)=|v|^{2}\quad q(v)=\|v\|^{2}\quad q(v)=\|v\|_{A}$	Vertical alignment of pipes with superscripts wrong in mathml mode
15 T376829 Done	\cancel{y}	$\cancel{y}$ $\cancel{y}$ ${\cancel {y}}$	\cancel{y} the strike is not visable in native mathml mode
16 T376838 Done	\begin{array}{lcr} z & = & a \\ f(x,y,z) & = & x + y + z \end{array}	$\begin{array}{ccc}z& =& a\\ f(x,y,z)& =& x+y+z\end{array}$ $\begin{array}{ccc}z& =& a\\ f(x,y,z)& =& x+y+z\end{array}$ ${\begin{array}{lcr}z&=&a\\f(x,y,z)&=&x+y+z\end{array}}$	\begin{array}{lcr} does not respect the optional alignment argument in MathML mode
17 T376883 open	\frac{x}{x}\quad\frac{x}{y}\quad\frac{x}{l}\quad\frac{x}{2}\quad\frac{x}{x}\quad\frac{y}x\quad\frac{l}x\quad\frac{2}x	$\frac{x}{x}\frac{x}{y}\frac{x}{l}\frac{x}{2}\frac{x}{x}\frac{y}{x}\frac{l}{x}\frac{2}{x}$ $\frac{x}{x}\frac{x}{y}\frac{x}{l}\frac{x}{2}\frac{x}{x}\frac{y}{x}\frac{l}{x}\frac{2}{x}$ ${\frac {x}{x}}\quad {\frac {x}{y}}\quad {\frac {x}{l}}\quad {\frac {x}{2}}\quad {\frac {x}{x}}\quad {\frac {y}{x}}\quad {\frac {l}{x}}\quad {\frac {2}{x}}$	Bad spacing for fractions with Safari in MathML mode
18 T376887 Done	<math>\cfrac{x}{1 + \cfrac{\cancel{y}}{\cancel{y}}} = \cfrac{x}{2}</math> <math>\begin{array}{lcr} z & = & a \\ f(x,y,z) & = & x + y + z \end{array}</math>	MediaWiki MathML: $\frac{x}{1+\frac{\cancel{y}}{\cancel{y}}}=\frac{x}{2}$ $\begin{array}{ccc}z& =& a\\ f(x,y,z)& =& x+y+z\end{array}$ MathJax SVG: ${\cfrac {x}{1+{\cfrac {\cancel {y}}{\cancel {y}}}}}={\cfrac {x}{2}}$ ${\begin{array}{lcr}z&=&a\\f(x,y,z)&=&x+y+z\end{array}}$	Formula in separate paragraphs displayed on the same line in Safari on Mac OS in MathML mode
19a T377057 open	\lim_{n\to +\infty}\left(1+\frac 1n\right)^n	$\underset{n\to +\mathrm{\infty }}{lim}{(1+\frac{1}{n})}^n$ $\underset{n\to +\mathrm{\infty }}{lim}{(1+\frac{1}{n})}^n$ $\lim _{n\to +\infty }\left(1+{\frac {1}{n}}\right)^{n}$	Too much space around operators when used in limits in MathML mode
19b	\text{let}\ {n \to +\infty}	$\text{let}n\to +\mathrm{\infty }$ $\text{let}n\to +\mathrm{\infty }$ ${\text{let}}\ {n\to +\infty }$	More space used when not in a script
20 T378433 Done	\mathfrak{ABCDEFGHI}	$𝔄𝔅ℭ𝔇𝔈𝔉𝔊ℌ\Im$ $𝔄𝔅ℭ𝔇𝔈𝔉𝔊ℌ\Im$ ${\mathfrak {ABCDEFGHI}}$	\mathfrak{ABCDEFGHI} appears as normal type in MathML mode on Chrome on Windows. Still broken for MathJax
21 T382672 Done	{\bf Spec}, \bf A, \bf B, \bf C, \bf D, \bf E, \bf F, \bf G	$𝐒𝐩𝐞𝐜,𝐀,𝐁,𝐂,𝐃,𝐄,𝐅,𝐆$ $𝐒𝐩𝐞𝐜,𝐀,𝐁,𝐂,𝐃,𝐄,𝐅,𝐆$ ${\bf {Spec}},{\bf {A,{\bf {B,{\bf {C,{\bf {D,{\bf {E,{\bf {F,{\bf {G}}}}}}}}}}}}}}$	Bold
22 T382716 open	\det\nolimits^{\frac{1}{2} }	${det}^{\frac{1}{2}}$ ${det}^{\frac{1}{2}}$ $\det \nolimits ^{\frac {1}{2}}$	Native MathMl rendering error in square root of the determinant
22 T382813	\begin{align} \int \limits_x A \\ \int \nolimits_x B \\ \operatorname{sn} \limits_x C \\ \operatorname{sn} \nolimits_x D \\ \operatorname{\int} \limits_x E \\ \displaystyle \sum \nolimits_n F \\ \displaystyle \sum \nolimits^n G \\ \operatorname{\Sigma} \limits_x H \\ \Sigma\limits_x I \end{align}	MathML $\begin{array}{c}\underset{x}{\int }A\\ {\int }_{x}B\\ \underset{x}{\mathrm{sn}}C\\ {\mathrm{sn}}_{x}D\\ \underset{x}{\mathrm{\int }}E\\ \sum _{n}F\\ {\sum }^{n}G\\ \underset{x}{\mathrm{\Sigma }}H\\ \underset{x}{\Sigma }I\end{array}$ SVG Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. TeX parse error: \limits is allowed only on operators"): {\displaystyle {\begin{aligned}\int \limits _{x}A\\\int \nolimits _{x}B\\\operatorname {sn} \limits _{x}C\\\operatorname {sn} \nolimits _{x}D\\\operatorname {\int } \limits _{x}E\\\displaystyle \sum \nolimits _{n}F\\\displaystyle \sum \nolimits ^{n}G\\\operatorname {\Sigma } \limits _{x}H\\\Sigma \limits _{x}I\end{aligned}}}	native: Improve rendering for \limits and \nolimits
23 T382669 open	\sum\nolimits_{n=1}^{\infty}	${\sum }_{n=1}^{\mathrm{\infty }}$ ${\sum }_{n=1}^{\mathrm{\infty }}$ $\sum \nolimits _{n=1}^{\infty }$	\nolimits will be ignored on sums in displaystyle
24 T388304	{n \choose k}	$(\genfrac{}{}{0ex}{}{n}{k})$ $(\genfrac{}{}{0ex}{}{n}{k})$ ${n \choose k}$	binomial coefficient
24 T388304	{n \choose k}	$(\genfrac{}{}{0ex}{}{n}{k})$ $(\genfrac{}{}{0ex}{}{n}{k})$ ${n \choose k}$	binomial coefficient, using choose
24b	\binom{n}{k}	$(\genfrac{}{}{0ex}{}{n}{k})$ $(\genfrac{}{}{0ex}{}{n}{k})$ ${\binom {n}{k}}$	binomial coefficient

New cases as of Aug 2025

Reported Phabricator bugs

Number	LaTex	Rendering	Notes
T375337 Done	\frac{a}{b/2}	$\frac{a}{b/2}$ $\frac{a}{b/2}$ ${\frac {a}{b/2}}$	Too much space around / in MathML formatting mode
T375340 Done	\binom{n}{k/2}	$(\genfrac{}{}{0ex}{}{n}{k/2})$ $(\genfrac{}{}{0ex}{}{n}{k/2})$ ${\binom {n}{k/2}}$	Too much space between fences and content in MathML formatting mode
T375346 declined	\begin{pmatrix} \begin{pmatrix}a&b\\ c&d\end{pmatrix} & \begin{pmatrix}e&f\\ g&h\end{pmatrix} \\ 0 & \begin{pmatrix}i&j\\ k&l\end{pmatrix} \end{pmatrix}	$\left(\begin{array}{cc}\left(\begin{array}{cc}a& b\\ c& d\end{array}\right)& \left(\begin{array}{cc}e& f\\ g& h\end{array}\right)\\ 0& \left(\begin{array}{cc}i& j\\ k& l\end{array}\right)\end{array}\right)$ $\left(\begin{array}{cc}\left(\begin{array}{cc}a& b\\ c& d\end{array}\right)& \left(\begin{array}{cc}e& f\\ g& h\end{array}\right)\\ 0& \left(\begin{array}{cc}i& j\\ k& l\end{array}\right)\end{array}\right)$ ${\begin{pmatrix}{\begin{pmatrix}a&b\\c&d\end{pmatrix}}&{\begin{pmatrix}e&f\\g&h\end{pmatrix}}\\0&{\begin{pmatrix}i&j\\k&l\end{pmatrix}}\end{pmatrix}}$	Lots of space around the cells in matrix evironments in MathML mode
T435274 reopened	\begin{array}{|c|c|c|} \hline a_{11} & a_{12} & a_{13} \\ a_{21} & a_{22} & a_{23} \\ \hline a_{31} & a_{32} & a_{33} \\ \hline \end{array}	$\begin{array}{ccc}{a}_{11}& a_{12}& a_{13}\\ a_{21}& a_{22}& a_{23}\\ a_{31}& a_{32}& a_{33}\end{array}$ $\begin{array}{ccc}{a}_{11}& a_{12}& a_{13}\\ a_{21}& a_{22}& a_{23}\\ a_{31}& a_{32}& a_{33}\end{array}$ ${\begin{array}{|c|c|c|}\hline a_{11}&a_{12}&a_{13}\\a_{21}&a_{22}&a_{23}\\\hline a_{31}&a_{32}&a_{33}\\\hline \end{array}}$	Remove menclose in context of matrix representation
T378257 duplicate	\operatorname{sn}\limits_x	$\underset{x}{\mathrm{sn}}$ $\underset{x}{\mathrm{sn}}$ $\operatorname {sn} \limits _{x}$	\limits is rendered verbatim in MathML mode and client-side MathJax
T379359 open	\cancelto{x}{y}	${\xcancel{y}}^x$ ${\xcancel{y}}^x$ ${\cancelto {x}{y}}$	Fix \cancelto{y} in native MathML mode Chrome
T380184 Done	\operatorname{vec}	$\mathrm{vec}$ $\mathrm{vec}$ $\operatorname {vec}$	$\mathrm{vec}$ crashes with native MathML
T380654 reopened	\begin{aligned}{\bar {X} }_{1}&=(X_{1,1}+\cdots +X_{1,n_{1} })/n_{1}\\[60pt]{\bar {X} }_{2}&=(X_{2,1}+\cdots +X_{2,n_{2} })/n_{2}\end{aligned}	MathML $\begin{array}{cc}{\overline{X}}_1& =(X_{1,1}+\cdots +X_{1,n_1})/n_1\\ {\overline{X}}_2& =(X_{2,1}+\cdots +X_{2,n_2})/n_2\end{array}$ SVG ${\begin{aligned}{\bar {X}}_{1}&=(X_{1,1}+\cdots +X_{1,n_{1}})/n_{1}\\[60pt]{\bar {X}}_{2}&=(X_{2,1}+\cdots +X_{2,n_{2}})/n_{2}\end{aligned}}$	vertical space between multline equations is ignored. Dupe of T375295
T381102 Done	\left(a\right)'	$\left(a\right)$ $\left(a\right)$ $\left(a\right)'$	$\left(a\right)$ in MathML and MathJax renders with one prime symbol too much
T381305 duplicate	<blockquote>quote</blockquote>Let <math forcemathmode=native>n</math> be an integer Let <math>n</math> be an integer <div style="display: float">quote</div>.	MathML quote Let $n$ be an integer Let $n$ be an integer quote . SVG quote Let $n$ be an integer Let $n$ be an integer quote .	MathML/MathJax next to floating element or <blockquote> not rendered inline
T382196 Done	\overbrace x	$\overbrace{x}$ $\overbrace{x}$ $\overbrace {x}$	\overbrace rendered below (not above) in MathML and client-side Mathjax
T382215 Done	a\ b \quad xy	$abxy$ $abxy$ $a\ b\quad xy$	TeX macro "\ " not inserting space in MathML and client-side MathJax
T384794 Done	a' \operatorname{a}'	$a^{\prime }{\mathrm{a}}^{\prime }$ $a^{\prime }{\mathrm{a}}^{\prime }$ $a'\operatorname {a} '$	Prime symbol after \operatorname not rendered as superscript
T386071 Done	_12	${}_{1}2$ ${}_{1}2$ $_{1}2$	<math>_1</math> not rendered as subscript
T386318 Done	\sin \cos^2	$\sin {\cos }^2$ $\sin {\cos }^2$ $\sin \cos ^{2}$	<math>\sin \cos^2</math> not rendered as superscript
T386585 Done T391889 dup	\textrm{foobar}	$\text{foobar}$ $\text{foobar}$ ${\textrm {foobar}}$	<math>\textrm{foobar}</math> results in "Math input error" with MathJax
T386787 Done	\begin{bmatrix} 1 & 0 \\ \end{bmatrix}	$\left[\begin{array}{cc}1& 0\end{array}\right]$ $\left[\begin{array}{cc}1& 0\end{array}\right]$ ${\begin{bmatrix}1&0\\\end{bmatrix}}$	Trailing linebreak via `\\` in <math> matrix should be ignored
T387249 Done	\hat{}	$\hat{}$ $\hat{}$ ${\hat {}}$	<math>\hat{}</math> generates invalid MathML
T387952 Done	{_{1}^2}	${}_1^2$ ${}_1^2$ ${_{1}^{2}}$	<math>{_{1}^2}</math> not rendered as subscript
T389154 open	\max_{D} \min_{A} \mathbb{E}	$\underset{D}{max}\underset{A}{min}𝔼$ $\underset{D}{max}\underset{A}{min}𝔼$ $\max _{D}\min _{A}\mathbb {E}$	Not enough space around min and max in native MathML mode
T390259 reopened	\mathbf{\Lambda}	$𝜦$ $𝜦$ $\mathbf {\Lambda }$	<math>\mathbf{\Lambda}</math> not bold
	1\textbf{1}1 A\textbf{B}C	$1\mathbf{\text{𝟏}}1A\mathbf{\text{𝐁}}C$ $1\mathbf{\text{𝟏}}1A\mathbf{\text{𝐁}}C$ $1{\textbf {1}}1A{\textbf {B}}C$	Also impacts numbers
T395489 open	\xleftarrow{n+\mu-1} B \xrightarrow[T]{n\pm i-1} C	$\stackrel{n+\mu -1}{\leftarrow }B\underset{T}{\overset{n\pm i-1}{\to }}C$ $\stackrel{n+\mu -1}{\leftarrow }B\underset{T}{\overset{n\pm i-1}{\to }}C$ $\xleftarrow {n+\mu -1} B{\xrightarrow[{T}]{n\pm i-1}}C$	Unreadable rendering of \xleftarrow with text in MathML mode
T397120 Done	\textbf{1}	$\mathbf{\text{𝟏}}$ $\mathbf{\text{𝟏}}$ ${\textbf {1}}$	\textbf{1} renders incorrectly in MathML and client-side MathJax modes
T401623 open	0.99	$0.99$ $0.99$ $0.99$	Bad kerning of decimal separator in MathML
T401718 open	\textstyle\sum_{i=0}^r \binom{m}{i}	${\sum }_{i=0}^r(\genfrac{}{}{0ex}{}{m}{i})$ ${\sum }_{i=0}^r(\genfrac{}{}{0ex}{}{m}{i})$ $\textstyle \sum _{i=0}^{r}{\binom {m}{i}}$	\textstyle not applied to \binom in MathML
T401740 open	\left\{ a \Bigg\vert \int \right\}	$\left\{a\right|\int \}$ $\left\{a\right|\int \}$ $\left\{a{\Bigg \vert }\int \right\}$	\Bigg\vert is not big in MathML
T401746 open	x := 1	$x:=1$ $x:=1$ $x:=1$	Bad spacing of <math>x := 1</math> in MathML
T401849 open	\mathrm{d}x	$\mathrm{d}x$ $\mathrm{d}x$ $\mathrm {d} x$	Too much space in <math>\mathrm{d}x</math> with MathML

New cases since Nov 2025

Reported Phabricator bugs

T410843	p(a|b)	$p(a|b)$ $p(a|b)$ $p(a|b)$	Too much space around a pipe symbol in MathML mode
T414276	\{x\in\R : f(x)=0\}	$\{x\in ℝ:f(x)=0\}$ $\{x\in ℝ:f(x)=0\}$ $\{x\in \mathbb {R} :f(x)=0\}$	Not enough spacing before colon
T417327 (Feb 2026)	\operatorname{X}(g) = (g(\operatorname{GS}(\mathbf{v}_1))	$\mathrm{X}(g)=(g(\mathrm{GS}({𝐯}_1))$ $\mathrm{X}(g)=(g(\mathrm{GS}({𝐯}_1))$ $\operatorname {X} (g)=(g(\operatorname {GS} (\mathbf {v} _{1}))$	Too much space around \operatorname

New cases since Aug 2026

Reported Phabricator bugs

T434424 (Aug 2026)	\begin{alignat}{3} f(a,b) & = (a+b)^2 && = (a+b)(a+b) \\ & = a^2+ab+ba+b^2 && = a^2+2ab+b^2 \\ \end{alignat}	$\begin{array}{cccc}f(a,b)& =(a+b{)}^2& & =(a+b)(a+b)\\ & =a^2+ab+ba+b^2& & =a^2+2ab+b^2\\ \end{array}$ $\begin{array}{cccc}f(a,b)& =(a+b{)}^2& & =(a+b)(a+b)\\ & =a^2+ab+ba+b^2& & =a^2+2ab+b^2\\ \end{array}$ ${\begin{alignedat}{3}f(a,b)&=(a+b)^{2}&&=(a+b)(a+b)\\&=a^{2}+ab+ba+b^{2}&&=a^{2}+2ab+b^{2}\\\end{alignedat}}$	Too much space before = in align at
T434428 (Aug 2026)	\Gamma \Delta \Theta \Xi \Omicron \Pi \Sigma \Upsilon \Phi \Chi \Psi \Omega	$\Gamma \Delta \Theta \Xi O\Pi \Sigma {\rm Y}\Phi \mathrm{X}\Psi \Omega$ $\Gamma \Delta \Theta \Xi O\Pi \Sigma {\rm Y}\Phi \mathrm{X}\Psi \Omega$ $\Gamma \Delta \Theta \Xi O\Pi \Sigma \Upsilon \Phi \mathrm {X} \Psi \Omega$	Capital Greek letter should be renderer in Roman and not italic. See full set of typefaces at Extension:Math/T434428
T434456 (Aug 2026)	\left(a\right)'	$\left(a\right)$ $\left(a\right)$ $\left(a\right)'$	Missing prime symbol
T434477 (Aug 2026)	\textstyle \frac{k-1}{k} \sum_{j=0}^\infty \frac 1 {\binom {j+x} k}= \frac{\binom{x-1}{k-1} }{n}	$\frac{k-1}{k}{\sum }_{j=0}^{\mathrm{\infty }}\frac{1}{(\genfrac{}{}{0ex}{}{j+x}{k})}=\frac{(\genfrac{}{}{0ex}{}{x-1}{k-1})}{n}$ $\frac{k-1}{k}{\sum }_{j=0}^{\mathrm{\infty }}\frac{1}{(\genfrac{}{}{0ex}{}{j+x}{k})}=\frac{(\genfrac{}{}{0ex}{}{x-1}{k-1})}{n}$ $\textstyle {\frac {k-1}{k}}\sum _{j=0}^{\infty }{\frac {1}{\binom {j+x}{k}}}={\frac {\binom {x-1}{k-1}}{n}}$	\frac does not correctly reduce font size of \binom. See testcases at Extension:Math/T434428
T434504 (Aug 2026)	\overline\alpha\ \bar\beta\ \overline{ABC}\ \bar{DEF}\ \overline{\operatorname{gd} z}	$\bar{\alpha }\overline{\beta }\overline{ABC}\overline{DEF}\overline{\mathrm{gd}z}$ $\bar{\alpha }\overline{\beta }\overline{ABC}\overline{DEF}\overline{\mathrm{gd}z}$ ${\overline {\alpha }}\ {\bar {\beta }}\ {\overline {ABC}}\ {\bar {DEF}}\ {\overline {\operatorname {gd} z}}$	Overline and bar too short
T434607 (Aug 2026)	\ddot{x}	$\ddot{x}$ $\ddot{x}$ ${\ddot {x}}$	Overline and bar too short