[css-text-decor] Add rule to use ruby variants for emphasis marks, per Ken Lunde's advice <https://lists.w3.org/Archives/Public/www-style/2016Dec/0094.html>

fantasai · fantasai · commit 22ed0ceb4192 · 2016-12-23T09:50:01.000+03:30
diff --git a/css-text-decor/Overview.bs b/css-text-decor/Overview.bs
@@ -663,13 +663,15 @@ Emphasis Mark Style: the 'text-emphasis-style' property</h3>
     the shape keyword computes to ''circle'' in horizontal <a>typographic modes</a> and
     ''sesame'' in vertical <a>typographic modes</a>.</p>
 
-  <p>The marks should be drawn using the element's font settings with its
-    size scaled down to 50%. However, not all fonts have all these glyphs,
-    and some fonts use inappropriate sizes for emphasis marks in these
-    code points. The UA may opt to use a font known to be good for
-    emphasis marks, or the marks may instead be synthesized by the UA.
-    Marks must remain upright in vertical <a>typographic modes</a>: like CJK
-    characters, they do not rotate to match the writing mode.</p>
+  <p>The marks should be drawn using the element's font settings
+    with the addition of the ''font-variant-east-asian/ruby'' feature
+    and the size scaled down 50%.
+    However, since not all fonts have all these glyphs,
+    and some fonts use inappropriate sizes for emphasis marks in these code points,
+    the UA may opt to use a font known to be good for emphasis marks,
+    or the marks may instead be synthesized by the UA.
+    Marks must remain upright in vertical <a>typographic modes</a>:
+    like CJK characters, they do not rotate to match the writing mode.
 
   <p class="note">
       One example of good fonts for emphasis marks is Adobe's opensource project,
@@ -789,7 +791,6 @@ Emphasis Mark Position: the 'text-emphasis-position' property</h3>
               <img alt="Emphasis marks appear on the right of each emphasized character in vertical Japanese text."
                   title="Emphasis applied on the right of a fragment of Japanese text"
                   src="text-emphasis-v.gif" height="89" width="34">
-
         <tr>
           <td scope="row">Mongolian
         <tr>
@@ -994,4 +995,5 @@ Changes</h2>
     <li>Added note to indicate that initial behavior of 'text-decoration-skip' with respect to leading and trailing spaces may change.
     <li>Fixed “Computed value” line for 'text-shadow'.
     <li>Various corrections to the default UA rules for 'text-emphasis-position' and 'text-underline-position'.
+    <li>Added rule to apply ''font-variant-east-asian/ruby'' to emphasis marks' font.
   </ul>
