only allow main in body/div

Author: annevk

images/content-venn.svg

@@ -10698,7 +10698,6 @@ console.assert(image.height === 200);</pre>
    <li><code>kbd</code></li>
    <li><code>label</code></li>
    <li><code>link</code> (if it is <span>allowed in the body</span>)</li>
-   <li><code>main</code></li>
    <li><code>map</code></li>
    <li><code>mark</code></li>
    <li><span>MathML <code>math</code></span></li>
@@ -10741,9 +10740,6 @@ console.assert(image.height === 200);</pre>
    <li><span data-x="text content">Text</span></li>
   </ul>
 
-  <p><dfn>Flow content excluding main</dfn> is <span>flow content</span>, but with no
-  <code>main</code> element descendants.</p>
-
 
   <h6>Sectioning content</h6>
 
@@ -11010,7 +11006,6 @@ https://software.hixie.ch/utilities/js/live-dom-viewer/?%3C%21DOCTYPE%20HTML%3E%
    <li><code>ins</code></li>
    <li><code>kbd</code></li>
    <li><code>label</code></li>
-   <li><code>main</code></li>
    <li><code>map</code></li>
    <li><code>mark</code></li>
    <li><span>MathML <code>math</code></span></li>
@@ -15145,7 +15140,8 @@ interface <dfn>HTMLStyleElement</dfn> : <span>HTMLElement</span> {
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>As the second element in an <code>html</code> element.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content</span>.</dd>
+   <dd>Zero or one <code>main</code> element optionally intermixed with <span>flow
+   content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="handler-window-onafterprint">onafterprint</code></dd>
@@ -15250,7 +15246,7 @@ interface <dfn>HTMLBodyElement</dfn> : <span>HTMLElement</span> {};
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -15393,7 +15389,7 @@ interface <dfn>HTMLBodyElement</dfn> : <span>HTMLElement</span> {};
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -15555,7 +15551,7 @@ interface <dfn>HTMLBodyElement</dfn> : <span>HTMLElement</span> {};
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -15732,7 +15728,7 @@ interface <dfn>HTMLBodyElement</dfn> : <span>HTMLElement</span> {};
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -16121,8 +16117,8 @@ Space is not the only void</pre>
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>, but with no <code>header</code> or
-   <code>footer</code> element descendants.</dd>
+   <dd><span>Flow content</span>, but with no <code>header</code> or <code>footer</code> element
+   descendants.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -16208,8 +16204,8 @@ Space is not the only void</pre>
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>, but with no <code>header</code> or
-   <code>footer</code> element descendants.</dd>
+   <dd><span>Flow content</span>, but with no <code>header</code> or <code>footer</code> element
+   descendants.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -16353,9 +16349,9 @@ Space is not the only void</pre>
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>, but with no <span>heading content</span>
-   descendants, no <span>sectioning content</span> descendants, and no <code>header</code>,
-   <code>footer</code>, or <code>address</code> element descendants.</dd>
+   <dd><span>Flow content</span>, but with no <span>heading content</span> descendants, no
+   <span>sectioning content</span> descendants, and no <code>header</code>, <code>footer</code>, or
+   <code>address</code> element descendants.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -17963,7 +17959,7 @@ a friend lost to the
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="attr-blockquote-cite">cite</code></dd>
@@ -18881,9 +18877,8 @@ first matching case):&lt;/p&gt;
    <dd>Before <code>dd</code> or <code>dt</code> elements inside <code>dl</code> elements.</dd>
    <dd>Before <code>dd</code> or <code>dt</code> elements inside <code>div</code> elements that are children of a <code>dl</code> element.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>, but with no <code>header</code>,
-   <code>footer</code>, <span>sectioning content</span>, or <span>heading content</span>
-   descendants.</dd>
+   <dd><span>Flow content</span>, but with no <code>header</code>, <code>footer</code>,
+   <span>sectioning content</span>, or <span>heading content</span> descendants.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -18968,11 +18963,9 @@ first matching case):&lt;/p&gt;
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd>Either: One <code>figcaption</code> element followed by <span>flow content excluding
-   main</span>.</dd>
-   <dd>Or: <span>Flow content excluding main</span> followed by one <code>figcaption</code>
-   element.</dd>
-   <dd>Or: <span>Flow content excluding main</span>.</dd>
+   <dd>Either: one <code>figcaption</code> element followed by <span>flow content</span>.</dd>
+   <dd>Or: <span>flow content</span> followed by one <code>figcaption</code> element.</dd>
+   <dd>Or: <span>flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -19196,9 +19189,9 @@ included with Exhibit B.
    <dd><span>Flow content</span>.</dd>
    <dd><span>Palpable content</span>.</dd>
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
-   <dd>Where <span>flow content</span> is expected.</dd>
+   <dd>As a child of a <code>body</code> or <code>div</code> element.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>, but with no <code>main</code> element descendants.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -19296,7 +19289,8 @@ included with Exhibit B.
    <dd>As a child of a <code>dl</code> element.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
    <dd>If the element is a child of a <code>dl</code> element: one or more <code>dt</code> elements followed by one or more <code>dd</code> elements, optionally intermixed with <span>script-supporting elements</span>.</dd>
-   <dd>If the element is not a child of a <code>dl</code> element: <span>Flow content</span>.</dd>
+   <dd>If the element is not a child of a <code>dl</code> element: zero or one <code>main</code>
+   element optionally intermixed with <span>flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
@@ -40553,7 +40547,7 @@ interface <dfn>HTMLTableRowElement</dfn> : <span>HTMLElement</span> {
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>As a child of a <code>tr</code> element.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>.</dd>
+   <dd><span>Flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="attr-tdth-colspan">colspan</code></dd>
@@ -40647,9 +40641,8 @@ interface <dfn>HTMLTableCellElement</dfn> : <span>HTMLElement</span> {
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>As a child of a <code>tr</code> element.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>, but with no <code>header</code>,
-   <code>footer</code>, <span>sectioning content</span>, or <span>heading content</span>
-   descendants.</dd>
+   <dd><span>Flow content</span>, but with no <code>header</code>, <code>footer</code>,
+   <span>sectioning content</span>, or <span>heading content</span> descendants.</dd>
    <!-- EDITING NOTE: If you remove 'heading content' from the list above, make sure to fix the definition of 'sectioning root' to include <th> elements -->
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
@@ -42779,8 +42772,7 @@ interface <dfn>HTMLTableCellElement</dfn> : <span>HTMLElement</span> {
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd><span>Flow content excluding main</span>, but with no <code>form</code> element
-   descendants.</dd>
+   <dd><span>Flow content</span>, but with no <code>form</code> element descendants.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="attr-form-accept-charset">accept-charset</code></dd>
@@ -52019,8 +52011,7 @@ out of 233&#x2009;257&#x2009;824 bytes available&lt;/meter>&lt;/p></pre>
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd>Optionally a <code>legend</code> element, followed by <span>flow content excluding
-   main</span>.</dd>
+   <dd>Optionally a <code>legend</code> element, followed by <span>flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="attr-fieldset-disabled">disabled</code></dd>
@@ -56418,7 +56409,7 @@ fur
    <dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
    <dd>Where <span>flow content</span> is expected.</dd>
    <dt><span data-x="concept-element-content-model">Content model</span>:</dt>
-   <dd>One <code>summary</code> element followed by <span>flow content excluding main</span>.</dd>
+   <dd>One <code>summary</code> element followed by <span>flow content</span>.</dd>
    <dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
    <dd><span>Global attributes</span></dd>
    <dd><code data-x="attr-details-open">open</code></dd>
@@ -115939,7 +115930,8 @@ interface <dfn>External</dfn> {
      <td>Document body</td>
      <td><span data-x="Sectioning root">sectioning root</span></td>
      <td><code>html</code></td>
-     <td><span data-x="Flow content">flow</span></td>
+     <td><span data-x="Flow content">flow</span>;
+         <code>main</code>*</td>
      <td><span data-x="global attributes">globals</span>;
          <code data-x="handler-window-onafterprint">onafterprint</code>;
          <code data-x="handler-window-onbeforeprint">onbeforeprint</code>;
@@ -116167,7 +116159,8 @@ interface <dfn>External</dfn> {
          <span data-x="Palpable content">palpable</span></td>
      <td><span data-x="Flow content">flow</span>;
          <code>dl</code></td>
-     <td><span data-x="Flow content">flow</span></td>
+     <td><span data-x="Flow content">flow</span>;
+         <code>main</code>*</td>
      <td><span data-x="global attributes">globals</span></td>
      <td><code>HTMLDivElement</code></td>
     </tr>
@@ -116567,10 +116560,10 @@ interface <dfn>External</dfn> {
 
     <tr>
      <th><code>main</code></th>
-     <td>Container for the dominant contents of another element</td>
-     <td><span data-x="Flow content">flow</span>;
-         <span data-x="Palpable content">palpable</span></td>
-     <td><span data-x="Flow content">flow</span></td>
+     <td>Container for the dominant contents of the document</td>
+     <td>none</td>
+     <td><code>body</code>;
+         <code>div</code></td>
      <td><span data-x="Flow content">flow</span></td>
      <td><span data-x="global attributes">globals</span></td>
      <td><code>HTMLElement</code></td>
@@ -117453,7 +117446,6 @@ interface <dfn>External</dfn> {
       <code>ins</code>;
       <code>kbd</code>;
       <code>label</code>;
-      <code>main</code>;
       <code>map</code>;
       <code>mark</code>;
       <span>MathML <code>math</code></span>;
@@ -117733,7 +117725,6 @@ interface <dfn>External</dfn> {
       <code>ins</code>;
       <code>kbd</code>;
       <code>label</code>;
-      <code>main</code>;
       <code>map</code>;
       <code>mark</code>;
       <span>MathML <code>math</code></span>;