Clarify #extent-region constraints (#469)

w3c · Jul 4, 2019 · 3179903 · 3179903
1 parent 6a0bdfe
commit 3179903
Showing 1 changed file with 10 additions and 4 deletions.
diff --git a/imsc1/spec/ttml-ww-profiles.html b/imsc1/spec/ttml-ww-profiles.html
@@ -3144,8 +3144,11 @@ <h4><code>#color</code></h4>
       <section id="text-extent-region">
         <h4><code>#extent-region</code></h4>
 
-        <p>The <code>tts:extent</code> attribute SHALL be present on all <code>region</code> elements, where it SHALL use
-        <code>px</code> units, percentage values, or root container relative units.</p>
+        <p>The <code>tts:extent</code> style property SHALL be specified on all the <code>region</code> elements of a
+				<a>Document Instance</a>.</p>
+
+				<p>The value of a <code>tts:extent</code> style property specified on a <code>region</code> element SHALL
+				use <code>px</code> units, percentage values, or root container relative units.</p>
       </section>
 
       <section id="text-fontFamily-generic">
@@ -3378,8 +3381,11 @@ <h4><code>#content</code></h4>
       <section id="image-extent-region">
         <h4><code>#extent-region</code></h4>
 
-        <p>The <code>tts:extent</code> attribute SHALL be present on all <code>region</code> elements, where it SHALL use
-        <code>px</code> units.</p>
+        <p>The <code>tts:extent</code> style property SHALL be specified on all the <code>region</code> elements of a
+				<a>Document Instance</a>.</p>
+
+				<p>The value of a <code>tts:extent</code> style property specified on a <code>region</code> element SHALL
+				use <code>px</code> units.</p>
       </section>
 
       <section id="image-length-negative">