[css-fonts] Specify font-language-override as a @font-face descriptor

w3c#1392

Author: Litherum

css-fonts-4/Overview.bs

@@ -11,6 +11,8 @@ Editor: John Daggett, Invited Expert, https://twitter.com/nattokirai, w3cid 4149
 Editor: Myles C. Maxfield, Apple Inc., mmaxfield@apple.com, w3cid 77180
 Abstract: This specification defines modifications to the existing <a href="https://drafts.csswg.org/css-fonts-3/">CSS Fonts 3</a> specification along with additional experimental features.
 At Risk: Synthesis of the 'font-variant-position' property
+At Risk: The 'font-language-override!!property' property
+At Risk: The 'font-language-override!!descriptor' descriptor
 Ignored Terms: font-palette, <named-palette-color>
 </pre>
 
@@ -2258,6 +2260,18 @@ Initial: auto
 For: @font-feature-values
 </pre>
 
+<h3 id="font-language-override-desc">
+Default font language overriding: the 'font-language-override' descriptor</h3>
+
+<pre class='descdef'>
+Name: font-language-override
+Value: normal | <<string>>
+For: @font-face
+Initial: normal
+</pre>
+
+This descriptor defines initial settings that apply when the font defined by an @font-face rule is rendered. It does not affect font selection. Values are identical to those defined for the 'font-language-override!!property' property defined below except that the value inherit is omitted. When multiple font feature descriptors, properties, or variations are used, the cumulative effect on text rendering is detailed in the section Font Feature and Variation Resolution below.
+
 <h2 id="font-matching-algorithm">Font Matching Algorithm</h2>
 
 The algorithm below describes how fonts are associated with individual runs of text.
@@ -2986,29 +3000,34 @@ text run.
 	Then, the values applied in this step should be clamped (possibly again) to the values
 	that are supported by the font.
 
-3. If the font is defined via an ''@font-face'' rule, the font variations
+3. If the font is defined via an ''@font-face'' rule, the font language override
+	implied by the 'font-language-override!!descriptor' descriptor in the ''@font-face'' rule.
+
+4. If the font is defined via an ''@font-face'' rule, the font variations
 	implied by the 'font-variation-settings!!descriptor' descriptor in the ''@font-face'' rule.
 
-4. If the font is defined via an ''@font-face'' rule, the font features
+5. If the font is defined via an ''@font-face'' rule, the font features
 	implied by the 'font-feature-settings!!descriptor' descriptor in the ''@font-face'' rule.
 
-5. Font variations implied by the value of the 'font-optical-sizing!!property' property.
+6. The font language override implied by the value of the 'font-language-override!!property' property.
+
+7. Font variations implied by the value of the 'font-optical-sizing!!property' property.
 
-6. Font features implied by the value of the 'font-variant!!property' property,
+8. Font features implied by the value of the 'font-variant!!property' property,
 	the related 'font-variant!!property' subproperties and any other CSS property
 	that uses OpenType features (e.g. the 'font-kerning!!property' property).
 
 	<!-- other CSS props override 'font-variant' but not 'font-feature-settings' -->
 	<!-- http://lists.w3.org/Archives/Public/www-style/2013Aug/0110.html -->
 
-7. Feature settings determined by properties other than 'font-variant!!property' or
+9. Feature settings determined by properties other than 'font-variant!!property' or
 	'font-feature-settings!!property'. For example, setting a
 	non-default value for the 'letter-spacing' property disables common ligatures.
 
-8. Font variations implied by the value of the 'font-variation-settings!!property' property.
+10. Font variations implied by the value of the 'font-variation-settings!!property' property.
 	These values should be clamped to the values that are supported by the font.
 
-9. Font features implied by the value of 'font-feature-settings!!property' property.
+11. Font features implied by the value of 'font-feature-settings!!property' property.
 
 This ordering allows authors to set up a general set of defaults
 for fonts within their ''@font-face'' rules, then override them with