Meta: export obsolete elements

For w3c/csswg-drafts#4030.

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@@ -116073,27 +116073,27 @@ if (s = prompt('What is your name?')) {
 
   <dl><!-- alphabetical by first element in the group, except CSS goes last -->
 
-   <dt><dfn><code>applet</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>applet</code></dfn></dt>
    <dd><p>Use <code>embed</code> or <code>object</code> instead.</p></dd>
 
-   <dt><dfn><code>acronym</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>acronym</code></dfn></dt>
    <dd><p>Use <code>abbr</code> instead.</p></dd>
 
-   <dt><dfn><code>bgsound</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>bgsound</code></dfn></dt>
    <dd><p>Use <code>audio</code> instead.</p></dd>
 
-   <dt><dfn><code>dir</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>dir</code></dfn></dt>
    <dd><p>Use <code>ul</code> instead.</p></dd>
 
    <dt><code>frame</code></dt>
    <dt><code>frameset</code></dt>
-   <dt><dfn><code>noframes</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>noframes</code></dfn></dt>
    <dd><p>Either use <code>iframe</code> and CSS instead, or use server-side includes to generate complete pages with the various invariant parts merged in.</p></dd>
 
-   <dt><dfn><code>isindex</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>isindex</code></dfn></dt>
    <dd><p>Use an explicit <code>form</code> and <span data-x="attr-input-type-text">text control</span> combination instead.</p></dd>
 
-   <dt><dfn><code>keygen</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>keygen</code></dfn></dt>
    <dd>
     <p>For enterprise device management use cases, use native on-device management capabilities.</p>
 
@@ -116102,43 +116102,43 @@ if (s = prompt('What is your name?')) {
     manually. <ref spec=WEBCRYPTO></p>
    </dd>
 
-   <dt><dfn><code>listing</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>listing</code></dfn></dt>
    <dd><p>Use <code>pre</code> and <code>code</code> instead.</p></dd>
 
-   <dt><dfn><code>menuitem</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>menuitem</code></dfn></dt>
    <dd><p>To implement a custom context menu, use script to handle the <code
    data-x="event-contextmenu">contextmenu</code> event.</p></dd>
 
-   <dt><dfn><code>nextid</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>nextid</code></dfn></dt>
    <dd><p>Use GUIDs instead.</p></dd>
 
-   <dt><dfn><code>noembed</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>noembed</code></dfn></dt>
    <dd><p>Use <code>object</code> instead of <code>embed</code> when fallback is necessary.</p></dd>
 
-   <dt><dfn><code>plaintext</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>plaintext</code></dfn></dt>
    <dd><p>Use the "<code>text/plain</code>" <span>MIME type</span> instead.</p></dd>
 
-   <dt><dfn><code>rb</code></dfn></dt>
-   <dt><dfn><code>rtc</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>rb</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>rtc</code></dfn></dt>
    <dd><p>Providing the ruby base directly inside the <code>ruby</code> element or using nested
    <code>ruby</code> elements is sufficient.</p></dd>
 
-   <dt><dfn><code>strike</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>strike</code></dfn></dt>
    <dd><p>Use <code>del</code> instead if the element is marking an edit, otherwise use <code>s</code> instead.</p></dd>
 
-   <dt><dfn><code>xmp</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>xmp</code></dfn></dt>
    <dd><p>Use <code>pre</code> and <code>code</code> instead, and escape "<code data-x="">&lt;</code>" and "<code data-x="">&amp;</code>" characters as "<code data-x="">&amp;lt;</code>" and "<code data-x="">&amp;amp;</code>" respectively.</p></dd>
 
-   <dt><dfn><code>basefont</code></dfn></dt>
-   <dt><dfn><code>big</code></dfn></dt>
-   <dt><dfn><code>blink</code></dfn></dt>
-   <dt><dfn><code>center</code></dfn></dt>
-   <dt><dfn><code>font</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>basefont</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>big</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>blink</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>center</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>font</code></dfn></dt>
    <dt><code>marquee</code></dt>
-   <dt><dfn><code>multicol</code></dfn></dt>
-   <dt><dfn><code>nobr</code></dfn></dt>
-   <dt><dfn><code>spacer</code></dfn></dt>
-   <dt><dfn><code>tt</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>multicol</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>nobr</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>spacer</code></dfn></dt>
+   <dt><dfn data-dfn-type="element"><code>tt</code></dfn></dt>
 
    <dd>