From 4dd386deebe9bf67d13ece936ad8acb24c1661af Mon Sep 17 00:00:00 2001
From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Fri, 27 Dec 2024 10:48:00 -0800
Subject: [PATCH] Add support for subscripts and superscripts

---
 imsc1/spec/ttml-ww-profiles.html | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/imsc1/spec/ttml-ww-profiles.html b/imsc1/spec/ttml-ww-profiles.html
index e3d8f92f..f4362dc7 100644
--- a/imsc1/spec/ttml-ww-profiles.html
+++ b/imsc1/spec/ttml-ww-profiles.html
@@ -1100,6 +1100,17 @@ <h2>Supported Features and Extensions</h2>
           <td><span class="prohibited label">prohibited</span></td>
         </tr>
 
+        <tr>
+          <td>
+            <a href="https://www.w3.org/TR/2018/REC-ttml2-20181108/#feature-fontVariant"><code>#fontVariant</code></a>
+          </td>
+
+          <td><span class="permitted label">permitted</span><br>
+            <small>Section <a href="#font-variant-constraints"></a> specifies additional constraints.</small></td>
+
+          <td><span class="prohibited label">prohibited</span></td>
+        </tr>
+
         <tr>
           <td>
             <a href="https://www.w3.org/TR/2018/REC-ttml2-20181108/#feature-fontWeight"><code>#fontWeight</code></a>
@@ -3518,7 +3529,19 @@ <h4>Slanted Japanese-language text</h4>
           (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 id="font-variant-constraints">
+        <h4><code>#fontVariant</code></h4>
+
+        <p>The computed value of the <code>tts:fontVariant</code> attribute SHALL be one of the
+        following:</p>
+        <ul class="short-list">
+          <li><code>normal</code>;</li>
+          <li><code>sub</code>; or</li>
+          <li><code>super</code>.</li>
+        </ul>
+      </section>
     </section>
   </section>
 
@@ -5083,6 +5106,10 @@ <h4>Added Features</h4>
             <tr>
               <td style="text-align:center"><em>Relative to the TT Feature namespace</em></td>
             </tr>
+            <tr>
+            <tr>
+              <td><code>#fontVariant</code></td>
+            </tr>
           </tbody>
         </table>
       </section>