Added note on using shear instead of italic or oblique for Japanese t…

…ext (#495)
w3c · Dec 22, 2019 · dc03bf1 · dc03bf1
1 parent 922a2ec
commit dc03bf1
Showing 1 changed file with 16 additions and 4 deletions.
diff --git a/imsc1/spec/ttml-ww-profiles.html b/imsc1/spec/ttml-ww-profiles.html
@@ -126,7 +126,7 @@
                             "publisher":"W3C",
                             "id":"ttml1-20181108",
                             "date":"8 November 2018"
-                          }  
+                          }
                       }
         };
   </script>
@@ -1056,7 +1056,8 @@ <h2>Supported Features and Extensions</h2>
             <a href="https://www.w3.org/TR/2018/REC-ttml2-20181108/#feature-fontStyle-italic"><code>#fontStyle-italic</code></a>
           </td>
 
-          <td><span class="permitted label">permitted</span></td>
+          <td><span class="permitted label">permitted</span><br>
+          <small>Section <a href="#text-italic-shear-oblique"></a> provides additional information.</small></td>
 
           <td><span class="prohibited label">prohibited</span></td>
         </tr>
@@ -1066,7 +1067,8 @@ <h2>Supported Features and Extensions</h2>
             <a href="https://www.w3.org/TR/2018/REC-ttml2-20181108/#feature-fontStyle-oblique"><code>#fontStyle-oblique</code></a>
           </td>
 
-          <td><span class="permitted label">permitted</span></td>
+          <td><span class="permitted label">permitted</span><br>
+          <small>Section <a href="#text-italic-shear-oblique"></a> provides additional information.</small></td>
 
           <td><span class="prohibited label">prohibited</span></td>
         </tr>
@@ -1601,7 +1603,8 @@ <h2>Supported Features and Extensions</h2>
             <a href="https://www.w3.org/TR/2018/REC-ttml2-20181108/#feature-shear"><code>#shear</code></a>
           </td>
 
-          <td><span class="permitted label">permitted</span></td>
+          <td><span class="permitted label">permitted</span><br>
+          <small>Section <a href="#text-italic-shear-oblique"></a> provides additional information.</small></td>
 
           <td><span class="prohibited label">prohibited</span></td>
         </tr>
@@ -3466,6 +3469,15 @@ <h4><code>ebutts:multiRowAlign</code></h4>
         <p class='note'>In contrast to this specification, [[EBU-TT-D]] specifies that the attribute
         <code>ebutts:multiRowAlign</code> is allowed only on the <code>style</code> element.</p>
       </section>
+
+      <section id="text-italic-shear-oblique" class="informative">
+          <h4>Slanted Japanese-language text</h4>
+
+          <p>Since (a) Japanese-language fonts typically do not include <em>italic</em> or <em>oblique</em> faces, and 
+          (b) Japanese-language slanted vertical text consists of characters slanted in the vertical direction (and not 
+          in the horizontal direction), it is recommended that <code>tts:shear</code> be specified to slant Japanese-language text
+          – instead of specifying <code>tts:fontStyle="italic"</code> or <code>tts:fontStyle="oblique"</code>.</p>
+        </section>
     </section>
   </section>