The Math-extension sadly doesn't support the phantom tag and shows an parser error:
```
Failed to parse (unknown function "\phantom"): {\displaystyle \frac{x+y+z}{x \phantom{+}\phantom{y}+z}}
```
Example code for mediawiki / TeX:
```
<math>\frac{x+y+z}{x \phantom{+}\phantom{y}+z}</math>
```
MathML code:
```
<math xmlns = "http://www.w3.org/1998/Math/MathML">
<mfrac>
<mrow>
<mi> x </mi>
<mo> + </mo>
<mi> y </mi>
<mo> + </mo>
<mi> z </mi>
</mrow>
<mrow>
<mi> x </mi>
<mphantom>
<mo> + </mo>
</mphantom>
<mphantom>
<mi> y </mi>
</mphantom>
<mo> + </mo>
<mi> z </mi>
</mrow>
</mfrac>
</math>
```
and here an example edit:
https://en.wikipedia.org/w/index.php?title=Wikipedia:Sandbox&oldid=974880776
And whoever it wants can use the following code for LibreOffice or OpenOffice:
```
{x + y + z} over {x {phantom +} {phantom y} + z}
```
Hence: LibreOffice and OpenOffice simply ignores the tag in the mediawiki-export extension and thus showing the complete x + y + z twwo times (above the bracket and under it).
For the mediawiki exporter extension code:
https://opengrok.libreoffice.org/xref/core/external/xsltml/xsltml_2.1.2.patch?r=2b383d19#1118
Progress:
- [x] implement texvcjs change
- [x] release texvcv version to npm (https://www.npmjs.com/package/mathoid-texvcjs/v/0.3.11)
- [ ] release texvcinfo version to npm (depends on https://github.com/peggyjs/peggy/issues/221, estimate 9.6.22)
- [ ] update mathoid (npm, testcases)
- [ ] announce update to community
- [ ] deploy mathoid
- [ ] update documentation on ctan