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| Nov 23 2023, 6:46 PM |
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From https://de.wikipedia.org/wiki/Portal_Diskussion:Mathematik#c-Christian1985-20231122184800-Physikerwelt-20231122183800 in a discussion about T350787.
On the reference page,
(screenshot taken from https://de.wikipedia.beta.wmflabs.org/w/index.php?title=Intbar&oldid=32121#Normale_Integrale)
the test expression is rendered incorrectly in the lower native section. The upper MathML section is the intended result.
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| Fix bracket sizes in Chrome | mediawiki/extensions/Math | master | +10 -2 | |
| Fix closing bracket size too big | mediawiki/extensions/Math | master | +12 -9 |
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Declined | Stegmujo | T310373 Make Mathoid Client a standalone class | |||
| Open | None | T327098 Implement Math Accessibility Features necessary for Intent attribute usage | |||
| Resolved | Physikerwelt | T302628 Implement native MathML rendering in Math | |||
| Resolved | Stegmujo | T351907 Closing bracket size too small | |||
| Invalid | None | T352735 Ensure that \bigl and friends are closed with corresponding right elements |
latexml sets maxsize and minsize to 120% for the brakets`<mo maxsize="120%" minsize="120%" >]</mo>` MathJax does a similar thing. I am wondering if this is a workaround for a bug, or how this is supposed to work.
<math forcemathmode=native>\gamma \,x + \ln\bigl[\Gamma(x + 1)\bigr]= \sum_{n=1}^{\infty}\biggl[ \frac{x}{n} - \ln\biggl(1 + \frac{x}{n}\biggr) \biggr]</math>related macro: "\bigr] "
Change 979078 had a related patch set uploaded (by Stegmujo; author: Stegmujo):
[mediawiki/extensions/Math@master] Fix closing bracket size too big
Change 979078 merged by jenkins-bot:
[mediawiki/extensions/Math@master] Fix closing bracket size too big
Hello @Stegmujo ,
hello @Physikerwelt ,
in Chrome the brakets are still rendered incorrectly, see
Formula 1 in section Klammern is wrong and also formula 5 in section "Weiteres".
Sorry, I did not clear the cache. After https://de.wikipedia.beta.wmflabs.org/wiki/Intbar?action=purge it looks fixed.
no it looks the same as in the picture
Before the fix was made the closing bracket in formula 5 was too big now it is too small.
The closing element has the same properties in both versions; however, the mrow structure differs. If one puts the opening and closing brackets in an additional mrow, it looks ok.
Note that the first formula is in displaystyle and the second in inline style. I wonder how this did happen.
Change 979688 had a related patch set uploaded (by Stegmujo; author: Stegmujo):
[mediawiki/extensions/Math@master] Fix bracket sizes
As a reference or comparison, here a correctly displayed simplified example of formula nr 5:
<math id="p2.1.m1.1" class="ltx_Math" alttext="\biggl{(}A_{n}^{\mathsf{c}}\biggr{)}^{\!\!\mathsf{c}}" display="inline">
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi> A </mi>
<mi>n</mi>
<mi>𝖼</mi>
</msubsup>
<mo maxsize="210%" minsize="210%">)</mo>
</mrow>
<mi>𝖼</mi>
</msup>
</math>MathJax as reference, this is also not displayed correctly:
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mrow data-mjx-texclass="OPEN">
<mo minsize="2.047em" maxsize="2.047em">(</mo>
</mrow>
<msubsup>
<mi>A</mi>
<mi>n</mi>
<mrow data-mjx-texclass="ORD">
<mrow data-mjx-texclass="ORD">
<mi mathvariant="sans-serif">c</mi>
</mrow>
</mrow>
</msubsup>
<msup>
<mrow data-mjx-texclass="CLOSE">
<mo minsize="2.047em" maxsize="2.047em">)</mo>
</mrow>
<mrow data-mjx-texclass="ORD">
<mstyle scriptlevel="0">
<mspace width="-0.167em"></mspace>
</mstyle>
<mstyle scriptlevel="0">
<mspace width="-0.167em"></mspace>
</mstyle>
<mrow data-mjx-texclass="ORD">
<mi mathvariant="sans-serif">c</mi>
</mrow>
</mrow>
</msup>
</math>The major difference is the usage of a wrapping msup element
This would be a "corrected" variant of MathJax, which displays correctly in Chrome:
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<msup>
<mrow data-mjx-texclass="OPEN">
<mo minsize="2.047em" maxsize="2.047em">(</mo>
<msubsup>
<mi>A</mi>
<mi>n</mi>
<mrow data-mjx-texclass="ORD">
<mrow data-mjx-texclass="ORD">
<mi mathvariant="sans-serif">c</mi>
</mrow>
</mrow>
</msubsup>
<mrow data-mjx-texclass="CLOSE">
<mo minsize="2.047em" maxsize="2.047em">)</mo>
</mrow>
</mrow>
<mrow data-mjx-texclass="ORD">
<mstyle scriptlevel="0">
<mspace width="-0.167em"></mspace>
</mstyle>
<mstyle scriptlevel="0">
<mspace width="-0.167em"></mspace>
</mstyle>
<mrow data-mjx-texclass="ORD">
<mi mathvariant="sans-serif">c</mi>
</mrow>
</mrow>
</msup>
</math>The major difference is the usage of a wrapping msup element
Solving this problem for Chrome in the Way LaTeXML does, requires an adaption of the grammar. The encapsulating brackets including the superscript have to be recognized with one item.
I guess it is a grammar bug, I'll investigate and create new ticket, as this is a whole new can of worms. At is first glance I t seems that the grammar only nows left as left left function but not bigl.
It's a grammar error, indeed.
physikerwelt@a1 texvcjs % ./bin/texvcjs '\bigl( a'
+{\bigl (}a
physikerwelt@a1 texvcjs % ./bin/texvcjs '\big( a'
+{\big (}a
physikerwelt@a1 texvcjs % ./bin/texvcjs '\left( a'
SWow https://gerrit.wikimedia.org/r/c/mediawiki/services/texvcjs/+/980006 suggests that there are cases in Wikipedia where there exists \bigl without corresponding right element. I suggest we only change it in wikitexvc, otherwise we will see pages with syntax errors immediately.
After careful investigation, there are high chances that this is a chrome bug. It is displayed correctly in Firefox and the overall mrow structure can not be changed without applying guessing and heuristics.