diff --git a/source b/source
index 7911c260429..df570110157 100644
--- a/source
+++ b/source
@@ -13312,8 +13312,8 @@ interface <dfn>HTMLLinkElement</dfn> : <span>HTMLElement</span> {
 
   <p>The types of link indicated (the relationships) are given by the value of the <dfn><code
   data-x="attr-link-rel">rel</code></dfn> attribute, which, if present, must have a value that is a
-  <span>set of space-separated tokens</span>. The <a href="#linkTypes">allowed keywords and their
-  meanings</a> are defined in a later section. <span w-nodev>If the <code
+  <span>unordered set of unique space-separated tokens</span>. The <a href="#linkTypes">allowed
+  keywords and their meanings</a> are defined in a later section. <span w-nodev>If the <code
   data-x="attr-link-rel">rel</code> attribute is absent, has no keywords, or if none of the keywords
   used are allowed according to the definitions in this specification, then the element does not
   create any links.</span></p>
@@ -22523,8 +22523,8 @@ document.body.appendChild(wbr);</code></pre>
   <p><span w-dev subdfn data-x="dom-a-rellist"></span>The <dfn><code
   data-x="attr-hyperlink-rel">rel</code></dfn> attribute on <code>a</code> and <code>area</code>
   elements controls what kinds of links the elements create. The attribute's value must be a
-  <span>set of space-separated tokens</span>. The <a href="#linkTypes">allowed keywords and their
-  meanings</a> are defined below.</p>
+  <span>unordered set of unique space-separated tokens</span>. The <a href="#linkTypes">allowed
+  keywords and their meanings</a> are defined below.</p>
 
   <p><code data-x="attr-hyperlink-rel">rel</code>'s
   <span data-x="concept-supported-tokens">supported tokens</span> are the keywords defined in
@@ -119375,12 +119375,12 @@ interface <dfn>External</dfn> {
      <td> <code data-x="attr-hyperlink-rel">a</code>;
           <code data-x="attr-hyperlink-rel">area</code>
      <td> Relationship between the location in the document containing the <span>hyperlink</span> and the destination resource
-     <td> <span>Set of space-separated tokens</span>*
+     <td> <span>Unordered set of unique space-separated tokens</span>*
     <tr>
      <th> <code data-x="">rel</code>
      <td> <code data-x="attr-link-rel">link</code>
      <td> Relationship between the document containing the <span>hyperlink</span> and the destination resource
-     <td> <span>Set of space-separated tokens</span>*
+     <td> <span>Unordered set of unique space-separated tokens</span>*
     <tr>
      <th> <code data-x="">required</code>
      <td> <code data-x="attr-input-required">input</code>;