[css-fonts-4] critical oblique angle is now 11 deg, fix w3c#2539

Author: svgeesus

css-fonts-4/Overview.bs

@@ -839,7 +839,7 @@ Font style: the 'font-style!!property' property</h3>
     multiple oblique faces at various angles,
     or various combinations thereof.
     The font matching routine will select a font to use which is closest to the requested angle.
-    In general, for a requested angle greater or equal to 20deg,
+    In general, for a requested angle greater or equal to 11deg,
     larger angles are preferred;
     otherwise, smaller angles are preferred.
     (See [[#font-matching-algorithm]].)
@@ -3471,8 +3471,8 @@ if all font style properties were set to their initial value.
 				2. Otherwise, italic values above the desired italic value are checked in ascending order followed by
 					italic values below the desired italic value, until 0 is hit. Only positive values of italic values are checked
 					in this stage.
-				3. If no match is found, oblique values greater than or equal to 20deg are checked in ascending order
-					followed by oblique values below 20deg in descending order, until 0 is hit. Only positive values of oblique values
+				3. If no match is found, oblique values greater than or equal to 11deg are checked in ascending order
+					followed by oblique values below 11deg in descending order, until 0 is hit. Only positive values of oblique values
 					are checked in this stage.
 
 					ISSUE: The threshold for preferring oblique over normal <a href="https://github.com/w3c/csswg-drafts/issues/2295">should be lower than the average angle</a>.
@@ -3488,7 +3488,7 @@ if all font style properties were set to their initial value.
 						As you can see, because font D contains the minimum italic value across the entire family, font D would be selected by this algorithm. However, if font D were somehow eliminated from the family, font E would then contain the lowest distance in the family, so it would be selected. If E were eliminated, C would be selected. If C were eliminated, font B would not be chosen immediately; instead, oblique values would be consulted and an oblique value might be chosen. However, if no oblique value is chosen, font B would then be selected, followed by font A.
 					</div>
 
-				If the value of 'font-style!!property' is ''oblique'' and the requested angle is greater than or equal to 20deg,
+				If the value of 'font-style!!property' is ''oblique'' and the requested angle is greater than or equal to 11deg,
 
 				<ol id="greater-oblique-steps">
 					1. If the matching set includes faces with oblique values containing the value of ''oblique'',
@@ -3517,7 +3517,7 @@ if all font style properties were set to their initial value.
 						</div>
 				</ol>
 
-				If the value of 'font-style!!property' is ''oblique'' and the requested angle is greater than or equal to 0deg and less than 20deg,
+				If the value of 'font-style!!property' is ''oblique'' and the requested angle is greater than or equal to 0deg and less than 11deg,
 
 				<ol id="lesser-oblique-steps">
 					1. If the matching set includes faces with oblique values containing the value of ''oblique'',
@@ -3548,7 +3548,7 @@ if all font style properties were set to their initial value.
 					As you can see, because font D contains the minimum oblique value across the entire family, font D would be selected by this algorithm. However, if font D were somehow eliminated from the family, font C would then contain the lowest distance in the family, so it would be selected. If C were eliminated, E would be selected. If E were eliminated, font B would not be chosen immediately; instead, italic values would be consulted and an italic value might be chosen. However, if no italic value is chosen, font B would then be selected, followed by font A.
 				</div>
 
-				If the value of 'font-style!!property' is ''oblique'' and the requested angle is less than 0deg and greater than -20deg, follow the steps <a href="#lesser-oblique-steps">above</a>, except with the negated values and opposite directions. If the value of 'font-style!!property' is ''oblique'' and the requested angle is less than or equal to -20deg, follow the steps <a href="#greater-oblique-steps">above</a>, except with the negated values and opposite directions.
+				If the value of 'font-style!!property' is ''oblique'' and the requested angle is less than 0deg and greater than -11deg, follow the steps <a href="#lesser-oblique-steps">above</a>, except with the negated values and opposite directions. If the value of 'font-style!!property' is ''oblique'' and the requested angle is less than or equal to -11deg, follow the steps <a href="#greater-oblique-steps">above</a>, except with the negated values and opposite directions.
 
 				If the value of 'font-style!!property' is ''font-style/normal'',
 
@@ -3567,7 +3567,7 @@ if all font style properties were set to their initial value.
 
 				If an oblique angle was found in the above search, all faces which don't include that oblique angle are excluded from the matching set. Otherwise, if an italic value was found in the above search, all faces which don't include that italic value are excluded from the matching set.
 
-				User agents are not required to distinguish between italic and oblique fonts. In such user agents, the 'font-style!!property' matching steps above are performed by mapping both italic values and oblique angles onto a common scale. The exact nature of this mapping is undefined, however, an italic value of 1 must map to the same value that an oblique angle of 20deg maps to. Within font
+				User agents are not required to distinguish between italic and oblique fonts. In such user agents, the 'font-style!!property' matching steps above are performed by mapping both italic values and oblique angles onto a common scale. The exact nature of this mapping is undefined, however, an italic value of 1 must map to the same value that an oblique angle of 11deg maps to. Within font
 				families defined via ''@font-face'' rules, italic and oblique
 				faces must be distinguished using the value of the
 				'font-style!!descriptor' descriptor.
@@ -7200,6 +7200,12 @@ Special thanks to Ilya Grigorik and David Kuettel for their help in developing t
 Changes
 </h2>
 
+<h3 id="changes-2021-07-29">Changes from the <a href="https://www.w3.org/TR/2021/WD-css-fonts-4-20210729/">29 July 2021 Working Draft</a> </h3>
+
+<ul>
+	<li>Reduced the critical angle for oblique font matching from 20deg to 11deg, per WG resolution</li>
+</ul>
+
 <h3 id="changes-2020-11-17">Changes from the <a href="https://www.w3.org/TR/2020/WD-css-fonts-4-20201117/">17 November 2020 Working Draft</a> </h3><!-- See https://github.com/w3c/csswg-drafts/commits/main/css-fonts-4/Overview.bs -->
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