GNU bug report logs - #27259
26.0.50; 26.0.50: EWW displays LaTeX formulas as extemely large

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Package: emacs;

Reported by: Wouter Beek <wouter <at> triply.cc>

Date: Mon, 5 Jun 2017 20:06:01 UTC

Severity: normal

Found in version 26.0.50

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#27259; Package emacs. (Mon, 05 Jun 2017 20:06:01 GMT) Full text and rfc822 format available.

Acknowledgement sent to Wouter Beek <wouter <at> triply.cc>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Mon, 05 Jun 2017 20:06:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Wouter Beek <wouter <at> triply.cc>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; 26.0.50: EWW displays LaTeX formulas as extemely large
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

Recent messages:
(No changes need to be saved)
Auto-saving...done
Saving file /home/wbeek/Publications/2017/The-Next-700-Linked-Data-Startups/main.tex...
Wrote /home/wbeek/Publications/2017/The-Next-700-Linked-Data-Startups/main.tex
Making completion list...
Contacting host: debbugs.gnu.org:443 [2 times]
Mark saved where search started
Quit [4 times]
Making completion list...
funcall-interactively: End of buffer [2 times]

Configured features:
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NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
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 (strings 32 363549 105884)
 (string-bytes 1 14216507)
 (vectors 16 97661)
 (vector-slots 8 2228133 85041)
 (floats 8 3579 1121)
 (intervals 56 306858 1975)
 (buffers 976 114))




Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#27259; Package emacs. (Thu, 24 Aug 2017 11:59:02 GMT) Full text and rfc822 format available.

Message #8 received at 27259 <at> debbugs.gnu.org (full text, mbox):

From: charles <at> aurox.ch (Charles A. Roelli)
To: Wouter Beek <wouter <at> triply.cc>
Cc: 27259 <at> debbugs.gnu.org
Subject: Re: bug#27259: 26.0.50;
 26.0.50: EWW displays LaTeX formulas as extemely large
Date: Thu, 24 Aug 2017 13:58:06 +0200
> From: Wouter Beek <wouter <at> 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?




Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#27259; Package emacs. (Thu, 31 Aug 2017 19:42:02 GMT) Full text and rfc822 format available.

Message #11 received at 27259 <at> debbugs.gnu.org (full text, mbox):

From: Wouter Beek <wouter <at> triply.cc>
To: charles <at> aurox.ch (Charles A. Roelli)
Cc: 27259 <at> debbugs.gnu.org
Subject: Re: bug#27259: 26.0.50;
 26.0.50: EWW displays LaTeX formulas as extemely large
Date: Thu, 31 Aug 2017 21:40:58 +0200
charles <at> aurox.ch (Charles A. Roelli) writes:

>> From: Wouter Beek <wouter <at> 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




Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#27259; Package emacs. (Tue, 05 Sep 2017 19:36:01 GMT) Full text and rfc822 format available.

Message #14 received at 27259 <at> debbugs.gnu.org (full text, mbox):

From: charles <at> aurox.ch (Charles A. Roelli)
To: Wouter Beek <wouter <at> triply.cc>
Cc: 27259 <at> debbugs.gnu.org
Subject: Re: 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 <at> triply.cc>
> Cc: 27259 <at> debbugs.gnu.org
> Date: Thu, 31 Aug 2017 21:40:58 +0200
> Content-Type: text/plain
> 
> charles <at> aurox.ch (Charles A. Roelli) writes:
> 
> >> From: Wouter Beek <wouter <at> 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>&#x2211;<!-- ∑ --></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>&#x22EF;<!-- ⋯ --></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.




Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#27259; Package emacs. (Thu, 12 Apr 2018 23:27:01 GMT) Full text and rfc822 format available.

Message #17 received at 27259 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: charles <at> aurox.ch (Charles A. Roelli)
Cc: Wouter Beek <wouter <at> triply.cc>, 27259 <at> debbugs.gnu.org
Subject: Re: bug#27259: 26.0.50;
 26.0.50: EWW displays LaTeX formulas as extemely large
Date: Fri, 13 Apr 2018 01:26:03 +0200
charles <at> aurox.ch (Charles A. Roelli) writes:

> <img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8411fe69f79f2971b7c7a453b0b547bb37e9f6df" .../>

ImageMagick and Emacs refuses to display that image:

arsi <at> corrigan:~$ display /tmp/a.svg
display-im6.q16: width or height exceeds limit `/tmp/magick-27365hcL0Svs4ikfZ' @ error/cache.c/OpenPixelCache/3802.

It's a weird image and starts with

<svg xmlns:xlink="http://www.w3.org/1999/xlink" width="57.793ex" height="6.843ex" style="vertical-align: -3.005ex;" viewBox="0 -1652.5 24883.2 2946.1" role="img" focusable="false" xmlns="http://www.w3.org/2000/svg" aria-labelledby="MathJax-SVG-1-Title">

That's...  some viewbox.

Anyway, this is not an Emacs issue, but an issue with the SVG libraries
Emacs uses, so I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no




bug closed, send any further explanations to 27259 <at> debbugs.gnu.org and Wouter Beek <wouter <at> triply.cc> Request was from Lars Ingebrigtsen <larsi <at> gnus.org> to control <at> debbugs.gnu.org. (Thu, 12 Apr 2018 23:27:02 GMT) Full text and rfc822 format available.

bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Fri, 11 May 2018 11:24:10 GMT) Full text and rfc822 format available.

This bug report was last modified 5 years and 323 days ago.

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