[css-tables] Working around bikeshed a bit

Author: FremyCompany

css-tables-3/Overview.bs

@@ -553,8 +553,10 @@ spec:css21; type:property; text:max-width
 		</div>
 
 		<div class="example">
-			<xmp class="lang-markup">
-				<!-- built using dom api, as this would be fixed by the html parser -->
+			<pre class="lang-markup" style="margin-bottom:0;padding-bottom:0;">
+				&lt;!-- built using dom api, as this would be fixed by the html parser --&gt;
+			</pre>
+			<xmp class="lang-markup" style="margin-top:0;padding-top:0;">
 				<grid style="display: table">
 					<row style="display: table-row">
 						<th rowspan="2">1</th>
@@ -1264,6 +1266,12 @@ spec:css21; type:property; text:max-width
 					as a length-percentage, in which case they are resolved
 					based on the table width (if it is definite, otherwise use 0).
 
+			<p>
+				For the purpose of calculating the outer min-content width of cells, 
+					descendants of table cells whose width depends on percentages of their parent cell' width
+					are considered to have an auto width if they have 'overflow' set to visible,
+					and a 0px height if they have not. 
+
 			<dl>
 				<!--------------------------------------------------------------------------------->
 				<dt><dfn>intermediate min-content width for span 1</dfn></dt>