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Thank you for your help and suggestions, Ulrike -- you are, of
course, quite correct in your observation that I am thinking of the
problem in terms of plain TeX, but for better or worse, that is the
only dialect of TeX with which I am familiar, and it is therefore
understandable, I think, that I adopt it as my mental model. But to
return to my real-life problem :<br>
<br>
In order to get a good visual balance between Latin text and text in
{Arabic/Hebrew/Hindi/Nepali/Bengali/Tibetan/...}, I need to load the
Latin font at its default size but the Arabic (etc) fonts at
different sizes. Is there really no way in which I can say (without
needing to use any additional commands in my document) something
analogous to :<br>
<blockquote type="cite">
<ol>
<li><tt>\setmainfont [Color=text-colour] {Noto Serif Bold
Italic}</tt>
</li>
<li><tt>\newfontface \thai [Color=text-colour, Language=Thai,
Script=Thai] {Noto Serif Thai Bold}</tt></li>
<li><b><tt>\newfontface \bengali [Color=text-colour,
Language=Bengali, Script=Bengali, Scale=1.2] {Noto Serif
Bengali Bold}</tt></b></li>
<li><b><tt>\newfontface \hindi [Color=text-colour,
Language=Hindi, Script=Devanagari, Scale=1.2] {Noto Serif
Devanagari Bold}</tt></b></li>
<li><b><tt>\newfontface \nepali [Color=text-colour,
Language=Nepali, Script=Devanagari, Scale=1.2] {Noto Serif
Devanagari Bold}</tt></b></li>
<li><tt>\newfontface \japanese [Color=text-colour,
Language=Japanese, Script=CJK] {Noto Sans CJK JP Bold}</tt></li>
<li><tt>\newfontface \korean [Color=text-colour,
Language=Korean, Script=CJK] {Noto Sans CJK KR Bold}</tt></li>
<li><tt>\newfontface \mandarin [Color=text-colour,
Language=Chinese Traditional, Script=CJK] {Noto Sans CJK TC
Bold}</tt></li>
<li><tt>\newfontface \tibetan [Color=text-colour,
Language=Tibetan, Script=Tibetan] {Noto Sans Tibetan Bold}</tt></li>
<li><b><tt>\newfontface \arabic [Color=text-colour,
Language=Arabic, Script=Arabic, Scale=1.414] {Noto Naskh
Arabic Bold}</tt></b></li>
<li><tt>\newfontface \hebrew [Color=text-colour,
Language=Hebrew, Script=Hebrew] {Noto Sans Hebrew Bold}</tt></li>
</ol>
</blockquote>
but expressing the size of the fonts in TeX dimensions rather than
as relative "Scale" values ?<br>
<br>
** Phil.<br>
<br>
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