[css-fonts] Marking @font-feature-values at risk

#577

Author: Litherum

css-fonts/Fonts.src.html

@@ -174,6 +174,16 @@ <h3 class="no-num no-toc" id="atrisk">Features at risk</h3>
 <ul>
 <li>fallback handling for text decoration in superscript/subscript variant glyphs ('font-variant-position')</li>
 <li>'font-language-override' property</li>
+<li>The <em>font specific</em> functions accepted by 'font-variant-alternates' and 'font-variant'. This includes the entire <code>@font-feature-values</code> at-rule, as well as the following functions:
+<ul>
+<li><a href="#stylistic">stylistic()</a></li>
+<li><a href="#styleset">styleset()</a></li>
+<li><a href="#character-variant">character-variant()</a></li>
+<li><a href="#swash">swash()</a></li>
+<li><a href="#ornaments">ornaments()</a></li>
+<li><a href="#annotation">annotation()</a></li>
+</ul>
+</li>
 </ul>
 
 <nav id="toc">