190109 2018-09-29 01:15:26 -0700 Not monospaced 2018-10-01 11:10:49 -0700 1 1 1 Unclassified WebKit CSS WebKit Local Build Unspecified Unspecified RESOLVED WONTFIX P2 Normal --- 1 dpa-webkit webkit-unassigned mcatanzaro oldest_to_newest 1464727 0 dpa-webkit 2018-09-29 01:15:26 -0700 I use WebKit from https://webkitgtk.org/ 2.22.2 with Epiphany 3.30.1 . In the latter I have chosen under “Preferences” as monospace font “Monospace Regular 10”. Visiting pages like https://tools.ietf.org/html/rfc4918 do not show text as monospace. The problem does not seem to be with Epiphany: https://gitlab.gnome.org/GNOME/epiphany/issues/82 . I have compiled WebKitGtk and Epiphany myself. How can I find out, why WebKit does not render monospaced areas as such? 1464857 1 mcatanzaro 2018-09-30 09:21:08 -0700 You almost certainly have applied some custom fontconfig contfiguratoion, which is not supportable. 1464927 2 dpa-webkit 2018-10-01 03:05:58 -0700 I did `fontconfig/configure && make install` hence I do not have custom fontconfig configuration. 1464973 3 mcatanzaro 2018-10-01 06:14:29 -0700 It's very hard to believe that this would be broken by default. Please post the output of: $ fc-match monospace I think it's almost surely going to return a non-Monospace font. You probably have some fontconfig configuration files in your home directory or something. 1465028 4 dpa-webkit 2018-10-01 09:14:49 -0700 That was it: creating ~/.config/fontconfig/fonts.conf with suitable <alias> <family>monospace</family> <prefer><family>Liberation Mono</family></prefer> </alias> tweaked both `fc-match monospace` and WebKit to use correct monospace font. 1465046 5 mcatanzaro 2018-10-01 09:49:19 -0700 Well something is wrong with your fontconfig installation, since that should be configured at the system level, and not require anything in your home directory.... 1465119 6 dpa-webkit 2018-10-01 11:10:49 -0700 Perhaps. I installed fonts manually. fontcongig seems to declare in its default configurition files which fonts are preferred monospace. fc-list :spacing=100 emits /usr/share/fonts/truetype/anonymous_pro/Anonymous_Pro.ttf: Anonymous Pro:style=Regular /usr/share/fonts/truetype/ubuntu-font-family-0.80/UbuntuMono-BI.ttf: Ubuntu Mono:style=Bold Italic /usr/share/fonts/truetype/noto-hints/NotoMono-Regular.ttf: Noto Mono:style=Regular /usr/share/fonts/truetype/liberation/LiberationMono-BoldItalic.ttf: Liberation Mono:style=Bold Italic /usr/share/fonts/truetype/noto-hints/NotoEmoji-Regular.ttf: Noto Emoji:style=Regular /usr/share/fonts/truetype/ubuntu-font-family-0.80/UbuntuMono-RI.ttf: Ubuntu Mono:style=Italic /usr/share/fonts/truetype/liberation/LiberationMono-Bold.ttf: Liberation Mono:style=Bold /usr/share/fonts/truetype/ubuntu-font-family-0.80/UbuntuMono-B.ttf: Ubuntu Mono:style=Bold /usr/share/fonts/truetype/liberation/LiberationMono-Regular.ttf: Liberation Mono:style=Regular /usr/share/fonts/truetype/liberation/LiberationMono-Italic.ttf: Liberation Mono:style=Italic /usr/share/fonts/truetype/anonymous_pro/Anonymous_Pro_BI.ttf: Anonymous Pro:style=Bold Italic /usr/share/fonts/truetype/anonymous_pro/Anonymous_Pro_I.ttf: Anonymous Pro:style=Italic /usr/share/fonts/truetype/ubuntu-font-family-0.80/UbuntuMono-R.ttf: Ubuntu Mono:style=Regular /usr/share/fonts/truetype/noto-hints/NotoColorEmoji.ttf: Noto Color Emoji:style=Regular /usr/share/fonts/truetype/anonymous_pro/Anonymous_Pro_B.ttf: Anonymous Pro:style=Bold but fc-match monospace printed a totally different font. Apparently for the output of fc-match the font properties are irrelepant and only the fc-configuration files matter, which by default do not mention the files from the list above and have to be set manually. The conclusion it, that Epiphany lets the user set a monospaced font, but the choice gets ignored, so the case went back to https://gitlab.gnome.org/GNOME/epiphany/issues/82 .