[css-text] Add note requested <http://lists.w3.org/Archives/Public/www-style/2014Jan/0443.html>

Author: fantasai

css-text/Overview.bs

@@ -182,6 +182,12 @@ Terminology</h3>
     Note that it is possible for the <i>content language</i> of an element
     to be unknown.
 
+  <p class="note">
+    Many typographic effects vary by linguistic context.
+    In CSS, language-specific typographic tailorings
+    are only applied when the content language is known.
+    Authors should tag their content accurately for the best typographic behavior.
+
   <p>Other terminology and concepts used in this specification are defined
     in [[!CSS21]] and [[!CSS3-WRITING-MODES]].
 
@@ -1433,10 +1439,10 @@ Canonical order: N/A
           UAs should, where possible, use a justification algorithm appropriate to the text.
           <p class="example">
           For example, the UA could use by default a justification method that is a
-          simple universal compromise for all writing systems,
-          such as primarily expanding <i>word separators</i>
+          simple universal compromise for all writing systems&mdash;such as
+          primarily expanding <i>word separators</i>
           along with secondarily expanding between CJK and Southeast Asian <i>letters</i>.
-          Then, in cases where the content language of the paragraph is known, 
+          Then, in cases where the <i>content language</i> of the paragraph is known,
           it could choose a more language-tailored justification behavior
           e.g. following [[JLREQ]] for Japanese,
           using cursive elongation for Arabic,
@@ -1492,6 +1498,9 @@ Canonical order: N/A
     <p>The exact justification algorithm is UA-dependent;
       however, CSS provides some general guidelines.
 
+    <p>Since optimal justification is language-sensitive,
+      authors should correctly language-tag their content for the best results.
+
 <h4 id="expanding-text">
 Expanding and Compressing Text</h4>
 

css-text/Overview.html

@@ -348,6 +348,12 @@ <h3 class="heading settled heading" data-level=1.3 id=terms><span class=secno>1.
     Note that it is possible for the <a data-link-type=dfn href=#content-language title="content language">content language</a> of an element
     to be unknown.
 
+  <p class=note>
+    Many typographic effects vary by linguistic context.
+    In CSS, language-specific typographic tailorings
+    are only applied when the content language is known.
+    Authors should tag their content accurately for the best typographic behavior.
+
   <p>Other terminology and concepts used in this specification are defined
     in <a data-biblio-type=normative data-link-type=biblio href=#css21 title=css21>[CSS21]</a> and <a data-biblio-type=normative data-link-type=biblio href=#css3-writing-modes title=css3-writing-modes>[CSS3-WRITING-MODES]</a>.
 
@@ -1576,10 +1582,10 @@ <h3 class="heading settled heading" data-level=7.3 id=text-justify-property><spa
           UAs should, where possible, use a justification algorithm appropriate to the text.
           <p class=example>
           For example, the UA could use by default a justification method that is a
-          simple universal compromise for all writing systems,
-          such as primarily expanding <a data-link-type=dfn href=#word-separator title="word separators">word separators</a>
+          simple universal compromise for all writing systems—such as
+          primarily expanding <a data-link-type=dfn href=#word-separator title="word separators">word separators</a>
           along with secondarily expanding between CJK and Southeast Asian <a data-link-type=dfn href=#letter0 title=letters>letters</a>.
-          Then, in cases where the content language of the paragraph is known, 
+          Then, in cases where the <a data-link-type=dfn href=#content-language title="content language">content language</a> of the paragraph is known,
           it could choose a more language-tailored justification behavior
           e.g. following <a data-biblio-type=informative data-link-type=biblio href=#jlreq title=jlreq>[JLREQ]</a> for Japanese,
           using cursive elongation for Arabic,
@@ -1630,6 +1636,9 @@ <h3 class="heading settled heading" data-level=7.3 id=text-justify-property><spa
     <p>The exact justification algorithm is UA-dependent;
       however, CSS provides some general guidelines.
 
+    <p>Since optimal justification is language-sensitive,
+      authors should correctly language-tag their content for the best results.
+
 <h4 class="heading settled heading" data-level=7.3.1 id=expanding-text><span class=secno>7.3.1 </span><span class=content>
 Expanding and Compressing Text</span><a class=self-link href=#expanding-text></a></h4>