Meta: mark seven definitions as exported

Helps with #9159.

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@@ -1525,10 +1525,10 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
 
   <p>This specification refers to both HTML and XML attributes and IDL attributes, often in the same
   context. When it is not clear which is being referred to, they are referred to as <dfn
-  data-x="">content attributes</dfn> for HTML and XML attributes, and <dfn data-x="">IDL
-  attributes</dfn> for those defined on IDL interfaces. Similarly, the term "properties" is used for
-  both JavaScript object properties and CSS properties. When these are ambiguous they are qualified
-  as <dfn data-x="">object properties</dfn> and <dfn data-x="">CSS properties</dfn> respectively.</p>
+  data-x="" data-lt="content attribute" export>content attributes</dfn> for HTML and XML attributes,
+  and <dfn data-x="">IDL attributes</dfn> for those defined on IDL interfaces. Similarly, the term
+  "properties" is used for both JavaScript object properties and CSS properties. When these are
+  ambiguous they are qualified as <dfn data-x="">object properties</dfn> and <dfn data-x="">CSS properties</dfn> respectively.</p>
 
   <p>Generally, when the specification states that a feature applies to <span>the HTML syntax</span>
   or <span>the XML syntax</span>, it also includes the other. When a feature specifically only
@@ -4737,12 +4737,12 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
 
   <h4>Keywords and enumerated attributes</h4>
 
-  <p>Some attributes, called <dfn data-x="enumerated attribute">enumerated attributes</dfn>, take
-  on a finite set of states. The state for such an attribute is derived by combining the
-  attribute's value, a set of keyword/state mappings given in the specification of each attribute,
-  and two possible special states that can also be given in the specification of the attribute.
-  These special states are the <dfn><i>invalid value default</i></dfn> and the <dfn><i>missing
-  value default</i></dfn>.</p>
+  <p>Some attributes, called <dfn data-x="enumerated attribute" data-lt="enumerated attribute"
+  export>enumerated attributes</dfn>, take on a finite set of states. The state for such an
+  attribute is derived by combining the attribute's value, a set of keyword/state mappings given in
+  the specification of each attribute, and two possible special states that can also be given in the
+  specification of the attribute. These special states are the <dfn><i>invalid value
+  default</i></dfn> and the <dfn><i>missing value default</i></dfn>.</p>
 
   <p class="note">Multiple keywords can map to the same state.</p>
 
@@ -7659,10 +7659,10 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
    element</span>'s <span>internal content attribute map</span>.</p></li>
   </ul>
 
-  <p>A <span>reflected IDL attribute</span> can be defined to <dfn>reflect</dfn> a <span>reflected
-  content attribute name</span> of a <span>reflected target</span>. In general this means that the
-  IDL attribute getter returns the current value of the content attribute, and the setter changes
-  the value of the content attribute to the given value.</p>
+  <p>A <span>reflected IDL attribute</span> can be defined to <dfn export>reflect</dfn> a
+  <span>reflected content attribute name</span> of a <span>reflected target</span>. In general this
+  means that the IDL attribute getter returns the current value of the content attribute, and the
+  setter changes the value of the content attribute to the given value.</p>
 
   <p>If the <span>reflected target</span> is an element, then the <span>reflected IDL
   attribute</span> can additionally declare to <dfn>support <code>ElementInternals</code></dfn>.
@@ -34676,7 +34676,8 @@ interface <dfn interface>HTMLTrackElement</dfn> : <span>HTMLElement</span> {
   <h4>Media elements</h4>
 
   <p><span>HTMLMediaElement</span> objects (<code>audio</code> and <code>video</code>, in this
-  specification) are simply known as <dfn data-x="media element">media elements</dfn>.</p>
+  specification) are simply known as <dfn data-x="media element" data-lt="media element"
+  export>media elements</dfn>.</p>
 
   <pre><code class="idl">enum <dfn enum>CanPlayTypeResult</dfn> { "" /* <span data-x="dom-CanPlayTypeResult-nil">empty string</span> */, "<span data-x="dom-CanPlayTypeResult-maybe">maybe</span>", "<span data-x="dom-CanPlayTypeResult-probably">probably</span>" };
 typedef (<span>MediaStream</span> or <span>MediaSource</span> or <span>Blob</span>) <dfn typedef>MediaProvider</dfn>;
@@ -89051,8 +89052,8 @@ interface <dfn interface>BeforeUnloadEvent</dfn> : <span>Event</span> {
   <ul>
    <li><p>An <dfn data-x="nav-id">id</dfn>, a <span>new unique internal value</span>.</p></li>
 
-   <li><p id="parent-browsing-context">A <dfn data-x="nav-parent">parent</dfn>, a
-   <span>navigable</span> or null.</p></li>
+   <li><p id="parent-browsing-context">A <dfn data-x="nav-parent" export for=navigable>parent</dfn>,
+   a <span>navigable</span> or null.</p></li>
 
    <li>
     <p id="current-entry">A <dfn data-x="nav-current-history-entry">current session history
@@ -123339,8 +123340,8 @@ console.assert(container.firstChild instanceof SuperP);
 
   <hr>
 
-  <p>An element is <dfn>being rendered</dfn> if it has any associated CSS layout boxes, SVG layout
-  boxes, or some equivalent in other styling languages.</p>
+  <p>An element is <dfn export>being rendered</dfn> if it has any associated CSS layout boxes, SVG
+  layout boxes, or some equivalent in other styling languages.</p>
 
   <p class="note">Just being off-screen does not mean the element is not <span>being
   rendered</span>. The presence of the <code data-x="attr-hidden">hidden</code> attribute normally
@@ -123383,7 +123384,8 @@ console.assert(container.firstChild instanceof SuperP);
   <span>HTML elements</span>.</p>
 
   <p>Some rules are intended for the author-level zero-specificity presentational hints part of the
-  CSS cascade; these are explicitly called out as <dfn>presentational hints</dfn>.</p>
+  CSS cascade; these are explicitly called out as <dfn data-lt="presentational hint"
+  export>presentational hints</dfn>.</p>
 
   <hr>