Make topmargin and leftmargin attributes apply to both sides

Fixes #11879.

Author: zcorpan

source

@@ -146320,31 +146320,15 @@ html, body { display: block; }</code></pre>
      <th>Source
    <tbody>
     <tr>
-     <td rowspan="3"><span>'margin-top'</span>
+     <td rowspan="3"><span>'margin-top'</span>, <span>'margin-bottom'</span>
      <td>The <code>body</code> element's <code data-x="attr-body-marginheight">marginheight</code> attribute
     <tr>
      <td>The <code>body</code> element's <code data-x="attr-body-topmargin">topmargin</code> attribute
     <tr>
      <td>The <code>body</code> element's <span>container frame element</span>'s <code data-x="attr-iframe-marginheight">marginheight</code> attribute
    <tbody>
     <tr>
-     <td rowspan="3"><span>'margin-right'</span>
-     <td>The <code>body</code> element's <code data-x="attr-body-marginwidth">marginwidth</code> attribute
-    <tr>
-     <td>The <code>body</code> element's <code data-x="attr-body-rightmargin">rightmargin</code> attribute
-    <tr>
-     <td>The <code>body</code> element's <span>container frame element</span>'s <code data-x="attr-iframe-marginwidth">marginwidth</code> attribute
-   <tbody>
-    <tr>
-     <td rowspan="3"><span>'margin-bottom'</span>
-     <td>The <code>body</code> element's <code data-x="attr-body-marginheight">marginheight</code> attribute
-    <tr>
-     <td>The <code>body</code> element's <code data-x="attr-body-bottommargin">bottommargin</code> attribute
-    <tr>
-     <td>The <code>body</code> element's <span>container frame element</span>'s <code data-x="attr-iframe-marginheight">marginheight</code> attribute
-   <tbody>
-    <tr>
-     <td rowspan="3"><span>'margin-left'</span>
+     <td rowspan="3"><span>'margin-left'</span>, <span>'margin-right'</span>
      <td>The <code>body</code> element's <code data-x="attr-body-marginwidth">marginwidth</code> attribute
     <tr>
      <td>The <code>body</code> element's <code data-x="attr-body-leftmargin">leftmargin</code> attribute