[css-fonts-3] refs for UAX15, UAX29

Author: svgeesus

css-fonts-3/Fonts.src.html

@@ -2340,7 +2340,7 @@ <h3 id="font-family-casing">Case sensitivity of font family names</h3>
 Implementors should take care to verify that a given caseless string comparison
 implementation uses this precise algorithm and not assume that a given
 platform string matching routine follows it, as many of these have
-locale-specific behavior or use some level of string normalization.</p>
+locale-specific behavior or use some level of string normalization [[!UAX15]].</p>
 
 <h3 id="font-style-matching">Matching font styles</h3>
 
@@ -2558,7 +2558,7 @@ <h3 id="cluster-matching">Cluster matching</h3>
 default glyph of the base character.</p>
 
 <p>A sequence of codepoints containing combining mark or other
-modifiers is termed a grapheme cluster (see [[CSS3TEXT]] for a
+modifiers is termed a grapheme cluster (see [[CSS3TEXT]] and [[UAX29]] for a
 more complete description).  For a given cluster containing
 a base character, <em>b</em> and a sequence of combining characters
 <em>c1, c2&hellip;</em>, the entire cluster is matched using these steps:</p>