[css-fonts-5] Added avar2 font tech, fix w3c#10599

Author: svgeesus

css-fonts-5/Overview.bs

@@ -33,6 +33,17 @@ spec:css-fonts-4;  type:property; text:font-weight
 spec:css-fonts-4; type:descriptor; text:src
 </pre>
 
+<pre class=biblio>
+	{
+		"avar2": {
+			"title": "avar — Axis Variations Table Version 2",
+			"href": "https://github.com/harfbuzz/boring-expansion-spec/blob/main/avar2.md",
+			"publisher": "HarfBuzz",
+			"date": "2022"
+		}
+	}
+</pre>
+
 
 <h2 id="introduction">
 Introduction</h2>
@@ -714,6 +725,30 @@ Issue(5466):
 Color Font Support</h2>
 -->
 
+<h2 id="font-technologies-formats">
+	Font Technologies and Formats
+</h2>
+
+<h3 id="font-tech-definitions">Font tech</h3>
+
+This section expands upon [[css-fonts-4#font-tech-definitions]].
+
+The 'avar2' tech refers to support for version 2 of OpenType axis variations [[!avar2]],
+for flexible variation axis remapping.
+
+<div class="example" id="ex-avar2">
+	For example, a font using variation axis remapping is loaded only if supported:
+
+	<pre>
+		@font-face {
+			font-family: 'Roboto Flex';
+			src: url('RobotoFlex-VF-avar2.woff2') format(woff2) tech(variations, avar2);
+			src: url('RobotoFlex-VF.woff2') format(woff2) tech(variations);
+			font-weight: 100 1000;
+			font-stretch: 25% 151%;
+		}
+	</pre>
+</div>
 
 <h2 id="security">Security Considerations</h2>
 
@@ -731,10 +766,12 @@ Acknowledgments</h2>
 	<a href="https://www.w3.org/TR/css-fonts-4/#acknowledgments">contributors to the previous level of this module</a>.
 
 	Secondly, we would like to acknowledge
+	Dave Crossland from Google,
 	Bernhard Fey from RealObjects,
 	Xiaocheng Hu from Google,
-	and
 	Jonathan Kew from Mozilla,
+	and
+	Laurence Penney
 	for their contributions to the improvements in this Level 5.
 
 <h2 id="changes">
@@ -743,7 +780,11 @@ Changes
 
 <h3 id="changes-20260206">Changes since the <a href="https://www.w3.org/TR/2024/WD-css-fonts-5-20240206/">WD of 6 February 2024</a></h3>
 
-<!-- none -->
+<ul>
+	<!-- to 18 Dec 2024 -->
+	<li>Added the avar2 font tech</li>
+	<li>Updated the incremental example to conform to the latest IFT specification</li>
+</ul>
 
 <h3 id="changes-20211221">Changes since the <a href="https://www.w3.org/TR/2021/WD-css-fonts-5-20211221/">WD of 21 December 2021</a> </h3>
 
@@ -753,7 +794,7 @@ Changes
 	<li>Set a range for the grammar of font-size-adjust number</li>
 	<li>Changed grammar of local() to use family-name instead for font-face-name</li>
 	<li>Updated to current incremental font download keywords</li>
-	<li>Made make feature-* plural for consistency with CSS Conditional 5, and 11.1 Font tech</li>
+	<li>Made feature-* plural for consistency with CSS Conditional 5, and 11.1 Font tech</li>
 	<li>Normalized infinity to ∞ in range notation </li>
 	<li>Fixed a typo in the tech() function</li>
 </ul>