diff --git a/source b/source
index a0b1ccb87c6..03565b035d9 100644
--- a/source
+++ b/source
@@ -125554,6 +125554,12 @@ interface <dfn interface>Navigator</dfn> {
 
   <div w-nodev>
 
+  <div algorithm>
+  <p>Each object that implements <code>NavigatorLanguage</code> has
+  an associated <dfn attribute for="NavigatorLanguage">plausible languages array</dfn>,
+  which is a frozen array of BCP 47 language tags. It is initially empty.</p>
+  </div>
+
   <div algorithm>
   <p>The <dfn attribute for="NavigatorLanguage"><code
   data-x="dom-navigator-language">language</code></dfn> getter steps are:</p>
@@ -125562,7 +125568,7 @@ interface <dfn interface>Navigator</dfn> {
    <li>Let <var>emulatedLanguage</var> be the <span>WebDriver BiDi emulated language</span> for
    <span>this</span>'s <span>relevant settings object</span>.</li>
 
-   <li>If <var>emulatedLanguage</var> is not null, return <var>emulatedLanguage</var>.</li>
+   <li>If <var>emulatedLanguage</var> is not null, then return <var>emulatedLanguage</var>.</li>
 
    <li>Return a valid BCP 47 language tag representing either <span>a plausible language</span> or
    the user's most preferred language. <ref>BCP47</ref></li>
@@ -125574,19 +125580,26 @@ interface <dfn interface>Navigator</dfn> {
   data-x="dom-navigator-languages">languages</code></dfn> getter steps are:</p>
 
   <ol>
-   <li>Let <var>emulatedLanguage</var> be the <span>WebDriver BiDi emulated language</span> for
-   <span>this</span>'s <span>relevant settings object</span>.</li>
+   <li>Let <var>languages</var> be an empty array.</li>
 
-   <li>If <var>emulatedLanguage</var> is not null, return a <span>frozen array</span> containing
-   <var>emulatedLanguage</var>.</li>
+   <li>Let <var>emulatedLanguage</var> be the <span>WebDriver BiDi emulated language</span>
+   for <span>this</span>'s <span>relevant settings object</span>.</li>
 
-   <li>Return a <span>frozen array</span> of valid BCP 47 language tags representing either one or
-   more <span data-x="a plausible language">plausible languages</span>, or the user's preferred
-   languages, ordered by preference with the most preferred language first. <ref>BCP47</ref></li>
-  </ol>
+   <li>If <var>emulatedLanguage</var> is not null, then set <var>languages</var> to
+   <span>frozen array</span> containing <var>emulatedLanguage</var>.</li>
+
+   <li>Otherwise, set <var>languages</var> to <span>frozen array</span> of
+   valid BCP 47 language tags representing either one or more
+   <span data-x="a plausible language">plausible languages</span>, or
+   the user's preferred languages, ordered by preference with
+   the most preferred language first. <ref>BCP47</ref></li>
 
-  <p>The same object must be returned until the user agent needs to return different values, or
-  values in a different order, or <var>emulatedLanguage</var> is updated.</p>
+   <li>If <var>languages</var> and <span>this</span>'s <var>plausible languages array</var>
+   do not have the same values in the same order, then set
+   <span>this</span>'s <span>plausible languages array</span> to <var>languages</var>.</li>
+
+   <li>Return <span>this</span>'s <span>plausible languages array</span>.</li>
+  </ol>
   </div>
 
   <div algorithm>