bug#40532: 28.0.50; eww/shr: Anchor link does not work

[Arnaud Fontaine]

Trying to  open an anchor  link invariably goes back  to the top  of the
page instead of going to the specific point on the page. Example:
  1. emacs -Q
  2. M-x eww => https://en.wikipedia.org/wiki/Emacs
  3. Click or press enter on `1. History` anchor link of the TOC (target: 
https://en.wikipedia.org/wiki/Emacs#History)
  4. This goes to the top of the page rather than the `History` section.

This problem is not  recent and I have had this issue  for some time now
(I use Emacs Git snapshot).

Any help appreciated. Thanks!


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.12, cairo 
version 1.14.8)
 of 2020-03-29 built on marvin
Repository revision: 52fab66c277cd8d83fad0bd6bda8234e102bdc02
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11907000
System Description: Hyperbola GNU/Linux-libre

Recent messages:
Quit
Mark set
b is undefined
scroll-down-command: Beginning of buffer

Mark set
Mark saved where search started
uncompressing eww.el.gz...done
Note: file is write protected
Mark set

Configured using:
 'configure --prefix=/opt/emacs-20200329-52fab66c'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 XDBE XIM MODULES THREADS PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
  shell-dirtrack-mode: t
  jabber-activity-mode: t
  desktop-save-mode: t
  savehist-mode: t
  window-numbering-mode: t
  show-paren-mode: t
  global-hl-line-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow eieio-opt speedbar ezimage dframe emacsbug gnus-draft org-id
tabify org-mobile cal-move mhtml-mode css-mode color js imenu cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs goto-addr pp sh-script smie executable misearch multi-isearch
ox-org ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util
rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
ox-icalendar ox-html table ox-ascii ox-publish ox sendmail help-fns
radix-tree cl-print debug backtrace jabber-rtt url-http url-gw url-cache
url-auth jabber-keepalive jabber-ping smiley gnus-cite mm-archive
mail-extr gnus-bcklg qp gnus-async gnus-ml disp-table gnus-topic nndraft
nnmh gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-cache
nnfolder utf-7 network-stream nsm nntp spam spam-stat gnus-uu yenc
gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime smime dig gnus-alias
imap rfc2104 nnrss bbdb-gnus bbdb-mua bbdb-com crm cl-extra help-mode
autorevert filenotify eww mm-url thingatpt url-queue vc-git diff-mode
cap-words superword subword python tramp-sh tramp tramp-loaddefs
trampver tramp-integration files-x tramp-compat shell ls-lisp jabber
jabber-notifications notifications jabber-libnotify dbus jabber-awesome
jabber-osd jabber-wmii jabber-xmessage jabber-festival jabber-sawfish
jabber-ratpoison jabber-tmux jabber-screen jabber-socks5
jabber-ft-server jabber-si-server jabber-ft-client jabber-ft-common
jabber-si-client jabber-si-common jabber-feature-neg jabber-truncate
jabber-time jabber-autoaway jabber-vcard-avatars jabber-chatstates
jabber-events jabber-vcard jabber-avatar jabber-activity jabber-watch
jabber-modeline jabber-ahc-presence jabber-ahc jabber-version
jabber-ourversion jabber-muc-nick-completion hippie-exp jabber-browse
jabber-search jabber-register jabber-roster jabber-presence jabber-muc
jabber-bookmarks jabber-private jabber-muc-nick-coloring hexrgb
jabber-widget jabber-disco jabber-chat jabber-history jabber-chatbuffer
jabber-alert jabber-iq jabber-core jabber-console sgml-mode ewoc
jabber-keymap jabber-sasl sasl sasl-anonymous sasl-login sasl-plain fsm
jabber-logon jabber-conn srv dns starttls tls gnutls jabber-xml
jabber-menu jabber-util tsdh-dark-theme desktop frameset
emms-librefm-stream emms-librefm-scrobbler emms-playlist-limit
emms-volume emms-volume-mixerctl emms-volume-pulse emms-volume-amixer
emms-i18n emms-history emms-score emms-stream-info
emms-metaplaylist-mode emms-bookmarks emms-cue emms-mode-line-icon
emms-browser sort emms-playlist-sort emms-last-played emms-player-xine
emms-player-mpd tq emms-playing-time emms-lyrics emms-url emms-streams
emms-show-all emms-tag-editor emms-mark emms-mode-line emms-cache
emms-info-opusinfo emms-info-ogginfo emms-info-mp3info
emms-playlist-mode emms-player-vlc emms-player-mpv emms-player-mplayer
emms-player-simple emms-source-playlist emms-source-file locate
emms-info-libtag emms-info later-do emms-setup emms emms-compat cal-iso
solar cal-dst diary-lib diary-loaddefs org-indent org-element avl-tree
ol-eww ol-rmail ol-mhe ol-irc ol-info ol-gnus nnir gnus-sum url
url-proxy url-privacy url-expand url-methods url-history mailcap shr
url-cookie url-domsuf url-util svg xml dom gnus-group gnus-undo
gnus-start gnus-cloud nnimap nnmail mail-source utf7 netrc nnoo
parse-time iso8601 gnus-spec gnus-int gnus-range message rmc puny rfc822
mml mml-sec epa derived epg epg-config mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader gnus-win gnus
nnheader gnus-util rmail rmail-loaddefs rfc2047 rfc2045 ietf-drums
text-property-search mail-utils mm-util mail-prsvr wid-edit ol-docview
doc-view jka-compr image-mode exif dired dired-loaddefs ol-bibtex bibtex
ol-bbdb ol-w3m org-agenda org-capture org ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-macro org-footnote org-src ob-comint org-pcomplete
pcomplete comint ansi-color org-list org-faces org-entities time-date
noutline outline org-version ob-emacs-lisp ob-core ob-eval org-table ol
org-keys org-compat org-macs org-loaddefs format-spec find-func bbdb
bbdb-site timezone japanese-holidays holidays hol-loaddefs cal-menu
calendar cal-loaddefs savehist etags fileloop generator xref project
ring ido mule-util alist pym static apel-ver product elscreen
window-numbering easy-mmode cl avoid paren whitespace iso-transl edmacro
kmacro server mozc-isearch advice hl-line finder-inf mozc info package
easymenu browse-url url-handlers url-parse auth-source cl-seq eieio
eieio-core cl-macs eieio-loaddefs password-cache json subr-x map
url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core term/tty-colors frame minibuffer cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1710522 112857)
 (symbols 48 42342 64)
 (strings 32 324435 27012)
 (string-bytes 1 10738281)
 (vectors 16 76001)
 (vector-slots 8 1682075 266556)
 (floats 8 1026 2335)
 (intervals 56 166551 3077)
 (buffers 1000 191))
-- 
Arnaud