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bug#27259: 26.0.50; 26.0.50: EWW displays LaTeX formulas as extemely lar
From: |
Charles A. Roelli |
Subject: |
bug#27259: 26.0.50; 26.0.50: EWW displays LaTeX formulas as extemely large |
Date: |
Tue, 05 Sep 2017 21:35:04 +0200 |
> Authentication-Results: sinyavsky.aurox.ch (amavisd-new); dkim=pass
> (2048-bit key) header.d=triply-cc.20150623.gappssmtp.com
> From: Wouter Beek <wouter@triply.cc>
> Cc: 27259@debbugs.gnu.org
> Date: Thu, 31 Aug 2017 21:40:58 +0200
> Content-Type: text/plain
>
> charles@aurox.ch (Charles A. Roelli) writes:
>
> >> From: Wouter Beek <wouter@triply.cc>
> >> Date: Mon, 05 Jun 2017 22:04:41 +0200
> >>
> >> 1. M-x eww
> >> 2. https://en.wikipedia.org/wiki/Triangular_number RET
> >> 3. Scroll down the page to an enormously large LaTeX formula.
> >>
> >> In GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
> >> of 2017-06-02 built on laptop
> >> Repository revision: f0d79d2b8d3a8a0b2aa7b39519d1df32f0e335e6
> >> Windowing system distributor 'The X.Org Foundation', version 11.0.11903000
> >> System Description: Ubuntu 17.04
> >
> > I can't reproduce it (using master under macOS). Does the problem
> > still occur for you?
>
> Thanks for looking into this! When I visit the same web page in EWW,
> Emacs version 25.2.1 (I moved back to using stable releases), I do not
> see a formula at all. Since this issue is better explained in a
> picture, I have uploaded a screenshot of this:
> http://wouterbeek.github.io/img/eww.png
Thanks for the screenshot. It looks like the problematic HTML is this
(the source code for the TeX formula):
<span class="mwe-math-element"><span class="mwe-math-mathml-inline
mwe-math-mathml-a11y" style="display: none;"><math
xmlns="http://www.w3.org/1998/Math/MathML" >
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<msub>
<mi>T</mi>
<mrow class="MJX-TeXAtom-ORD">
<mi>n</mi>
</mrow>
</msub>
<mo>=</mo>
<munderover>
<mo>∑<!-- ∑ --></mo>
<mrow class="MJX-TeXAtom-ORD">
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mrow class="MJX-TeXAtom-ORD">
<mi>n</mi>
</mrow>
</munderover>
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
<mo>+</mo>
<mn>2</mn>
<mo>+</mo>
<mn>3</mn>
<mo>+</mo>
<mo>⋯<!-- ⋯ --></mo>
<mo>+</mo>
<mi>n</mi>
<mo>=</mo>
<mrow class="MJX-TeXAtom-ORD">
<mfrac>
<mrow>
<mi>n</mi>
<mo stretchy="false">(</mo>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
<mo stretchy="false">)</mo>
</mrow>
<mn>2</mn>
</mfrac>
</mrow>
<mo>=</mo>
<mrow class="MJX-TeXAtom-ORD">
<mrow>
<mrow class="MJX-TeXAtom-OPEN">
<mo maxsize="2.047em" minsize="2.047em">(</mo>
</mrow>
<mfrac linethickness="0">
<mrow>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
<mn>2</mn>
</mfrac>
<mrow class="MJX-TeXAtom-CLOSE">
<mo maxsize="2.047em" minsize="2.047em">)</mo>
</mrow>
</mrow>
</mrow>
<mo>,</mo>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle T_{n}=\sum
_{k=1}^{n}k=1+2+3+\dotsb +n={\frac {n(n+1)}{2}}={n+1 \choose 2},}</annotation>
</semantics>
</math></span><img
src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8411fe69f79f2971b7c7a453b0b547bb37e9f6df"
class="mwe-math-fallback-image-inline" aria-hidden="true"
style="vertical-align: -3.171ex; width:58.093ex; height:7.176ex;"
alt="{\displaystyle T_{n}=\sum _{k=1}^{n}k=1+2+3+\dotsb +n={\frac
{n(n+1)}{2}}={n+1 \choose 2},}" /></span>
I doubt we support the code between the <math> tags, so I think what
/should/ show up is the "fallback" SVG image that Wikipedia provides:
<img
src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8411fe69f79f2971b7c7a453b0b547bb37e9f6df"
.../>
Please experiment with SVG files (such as the one above) to check if
they all have this rendering issue in Emacs.
Thanks in advance.
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Charles A. Roelli <=