GNU bug report logs - #55804
29.0.50; xwidget-webkit cannot render local html file

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

From: drshapeless <drsl <at> drshapeless.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; xwidget-webkit cannot render local html file
Date: Sun, 05 Jun 2022 18:43:33 +0800

When I use `xwidget-webkit-browse-url` to browse local html files,
e.g. "file:///home/user/test.html", only a blank page is shown.

But when I use `xwidget-webkit-browse-url` to browse external websites,
it can render normally, e.g. "https://google.com".

I thought xwidget did not support browsing local file, but from my
testing, every type of files other than html, including directories, can
be opened, e.g. "file:///home/user/test.png", "file:///home/user/".

This behaviour can only be observed on Linux machine, on macOS, it is
fine. I suspect the bug is related to gtk.


In GNU Emacs 29.0.50 (build 17, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo version 1.17.6)
 of 2022-06-05 built on artix
Repository revision: 993853531aebb303870d6ff1ba7db2007d464b63
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101003
System Description: Artix Linux

Configured using:
 'configure --with-native-compilation --with-imagemagick --with-x
 --with-x-toolkit=gtk3 --with-xinput2 --with-xwidgets'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES
NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3
THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE XIM XINPUT2 XPM XWIDGETS
GTK3 ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF8
  value of $LANG: en_US.UTF8
  value of $XMODIFIERS: @im=exwm-xim
  locale-coding-system: utf-8-unix

Major mode: xwidget-webkit

Minor modes in effect:
  global-auto-revert-mode: t
  electric-pair-mode: t
  display-time-mode: t
  windmove-mode: t
  exwm-firefox-mode: t
  pixel-scroll-precision-mode: t
  sly-symbol-completion-mode: t
  emms-playing-time-display-mode: t
  emms-playing-time-mode: t
  shell-switcher-mode: t
  corfu-history-mode: t
  global-corfu-mode: t
  corfu-mode: t
  projectile-mode: t
  global-aggressive-indent-mode: t
  which-key-mode: t
  marginalia-mode: t
  savehist-mode: t
  vertico-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  mood-line-mode: t
  org-roam-db-autosync-mode: t
  shell-dirtrack-mode: t
  leaf-key-override-global-mode: t
  straight-use-package-mode: t
  straight-package-neutering-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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Message #8 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: drshapeless <drsl <at> drshapeless.com>
Cc: 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sun, 05 Jun 2022 19:48:36 +0800

drshapeless <drsl <at> drshapeless.com> writes:

> When I use `xwidget-webkit-browse-url` to browse local html files,
> e.g. "file:///home/user/test.html", only a blank page is shown.
>
> But when I use `xwidget-webkit-browse-url` to browse external websites,
> it can render normally, e.g. "https://google.com".
>
> I thought xwidget did not support browsing local file, but from my
> testing, every type of files other than html, including directories, can
> be opened, e.g. "file:///home/user/test.png", "file:///home/user/".
>
> This behaviour can only be observed on Linux machine, on macOS, it is
> fine. I suspect the bug is related to gtk.

Does this only happen in Emacs, or in other WebKitGTK-based browsers
(try Epiphany) as well?

Message #11 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: drshapeless <drsl <at> drshapeless.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sun, 05 Jun 2022 20:52:35 +0800

Po Lu <luangruo <at> yahoo.com> writes:

> Does this only happen in Emacs, or in other WebKitGTK-based browsers
> (try Epiphany) as well?

I just tried epiphany, it does not open local html as well, instead it
downloads the local file...

I think it is not a Emacs bug then. There should be something wrong with
webkitgtk. This behaviour is stupid.

Message #14 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: drshapeless <drsl <at> drshapeless.com>
Cc: 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sun, 05 Jun 2022 21:22:01 +0800

drshapeless <drsl <at> drshapeless.com> writes:

> I just tried epiphany, it does not open local html as well, instead it
> downloads the local file...
>
> I think it is not a Emacs bug then. There should be something wrong with
> webkitgtk. This behaviour is stupid.

I guess that's because WebKit always tries to download local files.
It's been a while since I looked into that part of the xwidget code.  I
will try to find a way to provide an option to turn that behavior off.

Message #17 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Jacky Li <drsl <at> drshapeless.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sat, 11 Jun 2022 20:10:31 +0800

Po Lu <luangruo <at> yahoo.com> writes:

> I guess that's because WebKit always tries to download local files.
> It's been a while since I looked into that part of the xwidget code.  I
> will try to find a way to provide an option to turn that behavior off.

A reddit user "lskph5vg" solved the
bug. https://www.reddit.com/r/emacs/comments/v53jpw/xwidgets_cannot_render_local_file_on_linux/iby14j3/?context=3

This behaviour was first solved in stackoverflow by
"DisableGraphics". https://stackoverflow.com/a/71740957

This is a bug due to faulty MIME type database, which can be solved by
these commands.

rm ~/.local/share/mime/packages/user-extension-html.xml
update-mime-database ~/.local/share/mime

Which seems to have nothing to do with webkitgtk or emacs, the bug can
be closed.

Message #20 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Jacky Li <drsl <at> drshapeless.com>
Cc: luangruo <at> yahoo.com, 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sat, 11 Jun 2022 16:06:26 +0300

> Cc: 55804 <at> debbugs.gnu.org
> Date: Sat, 11 Jun 2022 20:10:31 +0800
> From:  Jacky Li via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Po Lu <luangruo <at> yahoo.com> writes:
> 
> > I guess that's because WebKit always tries to download local files.
> > It's been a while since I looked into that part of the xwidget code.  I
> > will try to find a way to provide an option to turn that behavior off.
> 
> A reddit user "lskph5vg" solved the
> bug. https://www.reddit.com/r/emacs/comments/v53jpw/xwidgets_cannot_render_local_file_on_linux/iby14j3/?context=3
> 
> This behaviour was first solved in stackoverflow by
> "DisableGraphics". https://stackoverflow.com/a/71740957
> 
> This is a bug due to faulty MIME type database, which can be solved by
> these commands.
> 
> rm ~/.local/share/mime/packages/user-extension-html.xml
> update-mime-database ~/.local/share/mime
> 
> Which seems to have nothing to do with webkitgtk or emacs, the bug can
> be closed.

Right, but I think it would be good to have this in etc/PROBLEMS.

Thanks.

Message #23 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Jacky Li <drsl <at> drshapeless.com>, 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sat, 11 Jun 2022 21:20:05 +0800

Eli Zaretskii <eliz <at> gnu.org> writes:

> Right, but I think it would be good to have this in etc/PROBLEMS.
>
> Thanks.

Sure, I'll write something.

Message #28 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefan <at> marxist.se>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Jacky Li <drsl <at> drshapeless.com>, Eli Zaretskii <eliz <at> gnu.org>,
 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Tue, 28 Jun 2022 14:21:42 -0700

Po Lu <luangruo <at> yahoo.com> writes:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>> Right, but I think it would be good to have this in etc/PROBLEMS.
>>
>> Thanks.
>
> Sure, I'll write something.

Did you write anything in etc/PROBLEMS?  Could this be closed?

Thanks.

Message #31 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Stefan Kangas <stefan <at> marxist.se>
Cc: Jacky Li <drsl <at> drshapeless.com>, Eli Zaretskii <eliz <at> gnu.org>,
 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Wed, 29 Jun 2022 09:01:42 +0800

Stefan Kangas <stefan <at> marxist.se> writes:

> Did you write anything in etc/PROBLEMS?  Could this be closed?

I forgot, sorry.  I will do that once I find a workaround better than
erasing files put there by the system, since that breaks thumbnail
generation for some reason.

Message #34 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Jacky Li <drsl <at> drshapeless.com>, Eli Zaretskii <eliz <at> gnu.org>,
 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Sat, 2 Sep 2023 09:47:30 -0700

Po Lu <luangruo <at> yahoo.com> writes:

>> Did you write anything in etc/PROBLEMS?  Could this be closed?
>
> I forgot, sorry.  I will do that once I find a workaround better than
> erasing files put there by the system, since that breaks thumbnail
> generation for some reason.

Any update on this?

Message #37 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Jacky Li <drsl <at> drshapeless.com>, Eli Zaretskii <eliz <at> gnu.org>,
 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Fri, 22 Dec 2023 06:53:54 -0800

Stefan Kangas <stefankangas <at> gmail.com> writes:

> Po Lu <luangruo <at> yahoo.com> writes:
>
>>> Did you write anything in etc/PROBLEMS?  Could this be closed?
>>
>> I forgot, sorry.  I will do that once I find a workaround better than
>> erasing files put there by the system, since that breaks thumbnail
>> generation for some reason.
>
> Any update on this?

Ping.

Message #40 received at 55804 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Kangas <stefankangas <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Jacky Li <drsl <at> drshapeless.com>, Eli Zaretskii <eliz <at> gnu.org>,
 55804 <at> debbugs.gnu.org
Subject: Re: bug#55804: 29.0.50; xwidget-webkit cannot render local html file
Date: Wed, 1 Jan 2025 19:20:22 -0600

Stefan Kangas <stefankangas <at> gmail.com> writes:

> Stefan Kangas <stefankangas <at> gmail.com> writes:
>
>> Po Lu <luangruo <at> yahoo.com> writes:
>>
>>>> Did you write anything in etc/PROBLEMS?  Could this be closed?
>>>
>>> I forgot, sorry.  I will do that once I find a workaround better than
>>> erasing files put there by the system, since that breaks thumbnail
>>> generation for some reason.
>>
>> Any update on this?
>
> Ping.

Yet another friendly ping.

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