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[css-fonts-4] Add notes for ui-* generic font family #12831 #12841

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Sep 22, 2025
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[css-fonts-4] Add notes for ui-* generic font family #12831 #12841

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15 changes: 13 additions & 2 deletions css-fonts-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -597,7 +597,7 @@ Generic font families</h4>

The precise font(s) used will depend on factors such as
platform support, platform language, locale settings,
user settings, Unicode coverage and the content language.
user preferences, Unicode coverage and the content language.
UA may optionally choose to use the text rendering engine provided by the platform when using
''system-ui'' to match the appearance of the default user interface more closely.

Expand Down Expand Up @@ -744,6 +744,8 @@ Generic font families</h4>
Note: ''ui-serif'' is not expected to map to any font on platforms
without an appropriate system font.

Note: see notes on ''system-ui'' for potential issues.

<div class="example" id="ex-sample-ui-serif">
<figure>
<img alt="sample ui-serif font" src="images/ui-serif.png" >
Expand All @@ -760,6 +762,8 @@ Generic font families</h4>
Note: ''ui-sans-serif'' is not expected to map to any font on platforms
without an appropriate system font.

Note: see notes on ''system-ui'' for potential issues.

<div class="example" id="ex-sample-ui-sans">
<figure>
<img alt="sample ui-sans-serif font" src="images/ui-sans-serif.png" >
Expand All @@ -777,6 +781,8 @@ Generic font families</h4>
Note: ''ui-monospace'' is not expected to map to any font on platforms
without an appropriate system font.

Note: see notes on ''system-ui'' for potential issues.

<div class="example" id="ex-sample-ui-mono">
<figure>
<img alt="sample ui-monospace font" src="images/ui-monospace.png" >
Expand All @@ -793,6 +799,8 @@ Generic font families</h4>
Note: ''ui-rounded'' is not expected to map to any font on platforms
without an appropriate system font.

Note: see notes on ''system-ui'' for potential issues.

<div class="example" id="ex-sample-ui-rounded">
<figure>
<img alt="sample ui-rounded font" src="images/ui-rounded.png" >
Expand Down Expand Up @@ -8158,7 +8166,10 @@ Any Installed Font which is not a User-Installed font is a Preinstalled Font. It
<h3 id="system-font">
System Font</h3>

The System Font is the font which is used by the ''system-ui'' <a href="#system-ui-def">generic font family name</a>. It is an example of a Preinstalled Font.
The System Font is the font which is used by the ''system-ui'' <a href="#system-ui-def">generic font family name</a>. It is an example of a Preinstalled Font.

Additional font styles may also be provided as <a href="#ui-sans-serif-def">''ui-sans-serif''</a>, <a href="#ui-serif-def">''ui-serif''</a>, <a href="#ui-monospace-def">''ui-monospace''</a>,
and <a href="#ui-rounded-def">''ui-rounded''</a> which are also Preinstalled Font(s) if the system provides them.

<wpt>
system-ui-ar.html
Expand Down