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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CSS reference: legacy table rules attribute</title>
+
+<style>
+table { margin: 1em 1em 2em 1em; border-collapse: collapse; }
+
+#a thead, #a tbody { border-block-end-width: 1px; border-block-end-style: solid; }
+#b thead, #b tbody { border-block-end: 1px solid blue; }
+#c thead, #c tbody { border-block-end-width: 5px; border-block-end-style: solid; }
+</style>
+
+<p>Borders between groups should be present:</p>
+<table id=a>
+ <thead><tr><td>head</td></tr></thead>
+ <tbody>
+   <tr><td>body</td><td>one</td></tr>
+   <tr><td>body</td><td>two</td></tr>
+ </tbody>
+ <tfoot><tr><td>foot</td></tr></tfoot>
+</table>
+
+<p>Borders between groups should be blue:</p>
+<table id=b>
+ <thead><tr><td>head</td></tr></thead>
+ <tbody>
+   <tr><td>body</td><td>one</td></tr>
+   <tr><td>body</td><td>two</td></tr>
+ </tbody>
+ <tfoot><tr><td>foot</td></tr></tfoot>
+</table>
+
+<p>Borders between groups should be 5px thick:</p>
+<table id=c>
+ <thead><tr><td>head</td></tr></thead>
+ <tbody>
+   <tr><td>body</td><td>one</td></tr>
+   <tr><td>body</td><td>two</td></tr>
+ </tbody>
+ <tfoot><tr><td>foot</td></tr></tfoot>
+</table>