use "character" because it's more readable, and then reference "grapheme cluster" at the end of the text-overflow definition for precision and UAX29 goodness.

Author: Tantek Çelik

css3-ui/Overview.html

@@ -55,12 +55,12 @@
    src="http://www.w3.org/Icons/w3c_home" width=72> </a>
    <h1>CSS Basic User Interface Module Level 3</h1>
 
-   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 26 January
+   <h2 class="no-num no-toc" id=longstatus-date>Editor's Draft 1 February
     2011</h2>
 
    <dl>
     <dt>This version:</dt>
-    <!-- <dd><a href="http://www.w3.org/TR/2011/ED-css3-ui-20110126">http://www.w3.org/TR/2011/ED-css3-ui-20110126</a></dd> -->
+    <!-- <dd><a href="http://www.w3.org/TR/2011/ED-css3-ui-20110201">http://www.w3.org/TR/2011/ED-css3-ui-20110201</a></dd> -->
 
     <dd><a
      href="http://dev.w3.org/csswg/css3-ui/">http://dev.w3.org/csswg/css3-ui/</a>
@@ -2922,7 +2922,7 @@ <h3 id=text-overflow><span class=secno>9.2. </span> Overflow Ellipsis: the
   <dl>
    <dt><dfn id=clip title="text-overflow:clip"><code>clip</code></dfn>
 
-   <dd>Clip text as appropriate. Glyphs may be only partially rendered.
+   <dd>Clip text as appropriate. Characters may be only partially rendered.
 
    <dt><dfn id=ellipsis
     title="text-overflow:ellipsis"><code>ellipsis</code></dfn>
@@ -2944,6 +2944,10 @@ <h3 id=text-overflow><span class=secno>9.2. </span> Overflow Ellipsis: the
     text-overflow ellipsis).
   </dl>
 
+  <p> The term "character" is used in this property definition for better
+   readability and means "grapheme cluster" <a href="#UAX29"
+   rel=biblioentry>[UAX29]<!--{{!UAX29}}--></a> for implementation purposes.
+
   <div class=example>
    <p style="display:none">Example(s):</p>
 
@@ -3826,6 +3830,15 @@ <h3 class="no-num no-toc" id=normative-references>Normative References</h3>
     </dd>
    <!---->
 
+   <dt id=UAX29>[UAX29]
+
+   <dd>Mark Davis. <a
+    href="http://www.unicode.org/unicode/reports/tr29/tr29-9.html"><cite>Text
+    Boundaries.</cite></a> 25 March 2005. Unicode Standard Annex #29. URL: <a
+    href="http://www.unicode.org/unicode/reports/tr29/tr29-9.html">http://www.unicode.org/unicode/reports/tr29/tr29-9.html</a>
+    </dd>
+   <!---->
+
    <dt id=URI>[URI]
 
    <dd>T. Berners-Lee; R. Fielding; L. Masinter. <a

css3-ui/Overview.src.html

@@ -1548,7 +1548,7 @@ <h3 id="text-overflow">
 
 <dl>
   <dt><dfn title="text-overflow:clip"><code>clip</code></dfn></dt>
-    <dd>Clip text as appropriate. Glyphs may be only partially rendered.</dd>
+    <dd>Clip text as appropriate. Characters may be only partially rendered.</dd>
 
   <dt><dfn title="text-overflow:ellipsis"><code>ellipsis</code></dfn></dt>
     <dd>Render an ellipsis character (U+2026) to represent clipped text 
@@ -1567,6 +1567,10 @@ <h3 id="text-overflow">
 deeper descendants without text-overflow ellipsis).</dd>
 </dl>
 
+<p>
+The term "character" is used in this property definition for better readability and means "grapheme cluster" [[!UAX29]] for implementation purposes.
+</p>
+
 <div class="example"><p style="display:none">Example(s):</p>
 <h4 class="no-num no-toc">text-overflow examples</h4>
 <p>These examples demonstrate setting the text-overflow of a block-level element that has text which overflows its dimensions: