https://bugzilla.redhat.com/show_bug.cgi?id=2062386
Bug ID: 2062386
Summary: strange font priorities in Firefox
Product: Fedora
Version: 35
Hardware: x86_64
OS: Linux
Status: NEW
Component: Fonts
Assignee: i18n-b...@lists.fedoraproject.org
Reporter: skyfal...@gmail.com
QA Contact: fonts-bugs@lists.fedoraproject.org
Target Milestone: ---
Classification: Fedora
Description of problem:
Sometimes, when using a native font stack in CSS on a web page, fonts that are
not in the font stack at all are substituted for the desired fonts.
This only seems to affect web pages viewed using:
- Fedora (not Ubuntu, Debian 11, or Manjaro)
- Firefox (not Chrome or Chromium)
- When using the RPM version or Mozilla's official build from their website
(not the Flatpak)
Happens in the stable version of Firefox, Firefox Beta, and Firefox nightly.
Two substitutions I've identified so far:
- Droid Sans is substituted for Open Sans
- P052 is substituted for 'URW Palladio L' or Palatino
Substituting for Palatino may be less objectionable, since that's a generic
choice, but URW Palladio L is rather specific and it's surprising to see the
substitution. This also wouldn't be as objectionable if the font substitutions
were better. Droid Sans doesn't look much like Open Sans at all, and P052 looks
really ugly (it has unevenly sized letters). In Firefox Flatpak, it instead
substitutes the better-looking 'TeX Gyre Pagella', and only does that for
Palatino, not for 'URW Palladio L' (which was higher priority in my font
stack). This is more desirable behavior.
The source of the problem seems to be that if you run the following command:
fc-match :family="Open Sans"
It returns Droid Sans.
Possibly related bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1820166
https://bugzilla.mozilla.org/show_bug.cgi?id=1406790
How reproducible:
Consistently
Steps to Reproduce:
1. Open a clean Fedora 35 install, and verify that Open Sans is not installed.
2. Create the following web page and view it in a browser:
```
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
h1,h2,h3,h4 {
font-family: Open Sans, Fira Sans;
}
</style>
</head>
<body>
<h1>Hello World</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body>
</html>
```
Alternately, view a real live (but more complex) website at
https://www.maximumethics.dev/
Actual results:
Notice that the text on the webpage is displayed in Droid Sans, not Open Sans.
Expected results:
The webpage displays the next available font in the font stack, Fira Sans in
this case, or the browser's default font if you don't have Fira Sans.
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https://bugzilla.redhat.com/show_bug.cgi?id=2062386
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