diff --git a/index.bs b/index.bs
index 0d2df30..2621776 100644
--- a/index.bs
+++ b/index.bs
@@ -383,8 +383,8 @@ platform UI or media keys, thereby improving the user experience.
         the playback has a notion of playlist.
       </li>
       <li>
-        <dfn enum-value for=MediaSessionAction>skipad</dfn>: the action's
-        intent is to skip the advertisement that is currently playing.
+        <dfn enum-value for=MediaSessionAction>skip</dfn>: the action's
+        intent is to skip the media item that is currently playing.
       </li>
       <li>
         <dfn enum-value for=MediaSessionAction>stop</dfn>: the action's intent
@@ -751,7 +751,7 @@ enum MediaSessionAction {
   "seekforward",
   "previoustrack",
   "nexttrack",
-  "skipad",
+  "skip",
   "stop",
   "seekto",
   "togglemicrophone",
@@ -1079,6 +1079,7 @@ interface MediaMetadata {
   attribute DOMString title;
   attribute DOMString artist;
   attribute DOMString album;
+  readonly attribute MediaKind kind;
   attribute FrozenArray&lt;object> artwork;
   [SameObject] readonly attribute FrozenArray&lt;ChapterInformation> chapterInfo;
 };
@@ -1087,9 +1088,21 @@ dictionary MediaMetadataInit {
   DOMString title = "";
   DOMString artist = "";
   DOMString album = "";
+  MediaKind kind = "";
   sequence&lt;MediaImage> artwork = [];
   sequence&lt;ChapterInformationInit> chapterInfo = [];
 };
+
+enum MediaKind {
+  "advertisement",
+  "closing-credits",
+  "cold-open-scene",
+  "opening-credits",
+  "post-credits-scene",
+  "summary",
+  "content",
+  ""
+};
 </pre>
 
 <p>
@@ -1109,6 +1122,46 @@ dictionary MediaMetadataInit {
   which are DOMString.
 </p>
 
+<p>
+  A {{MediaMetadata}} has an associated <dfn for="MediaMetadata">kind</dfn>,
+  which is a {{MediaKind}}, which can have one of the following value:
+</p>
+<ul>
+  <li>
+    <dfn enum-value for=MediaKind>advertisement</dfn>: the media content represents advertisements.
+  </li>
+  <li>
+    <dfn enum-value for=MediaKind>closing-credits</dfn>: the media content represents closing credits,
+    typically happening at the end of a video.
+  </li>
+  <li>
+    <dfn enum-value for=MediaKind>cold-open-scene</dfn>: the media content represents a cold open scene,
+    typically happening at the very beginning of a video, before opening credits.
+  </li>
+  <li>
+    <dfn enum-value for=MediaKind>opening-credits</dfn>: the media content represents opening credits,
+    typically happening at the beginning of a video.
+  </li>
+  <li>
+    <dfn enum-value for=MediaKind>post-credits-scene</dfn>: the media content represents a post credits scene,
+    typically happening after the closing credits.
+  </li>
+  <li>
+    <dfn enum-value for=MediaKind>summary</dfn>: the media content represents a summary,
+    typically happening at the beginning of a TV series episode and summarizing past episodes.
+  </li>
+  <li>
+    <dfn enum-value for=MediaKind>content</dfn>: the media content represents the main media content,
+    like a song or a TV series episode.
+  </li>
+  <li>
+    the empty string: the default value of media content, it represents any other value of a part of media content.
+  </li>
+</ul>
+<p class=note>
+  This enumeration is experimental and is subject to changes.
+</p>
+
 <p>
   A {{MediaMetadata}} has an associated sequence of <dfn
   for="MediaMetadata">artwork images</dfn>, which is a sequence of type
@@ -1130,6 +1183,7 @@ dictionary MediaMetadataInit {
   <li>Its <a for=MediaMetadata>title</a> is the empty string.</li>
   <li>Its <a for=MediaMetadata>artist</a> is the empty string.</li>
   <li>Its <a for=MediaMetadata>album</a> is the empty string.</li>
+  <li>Its <a for=MediaMetadata>kind</a> is the empty string.</li>
   <li>Its <a for=MediaMetadata title='artwork image'>artwork images</a> length
   is <code>0</code>.</li>
   <li>Its <a for=MediaMetadata>chapter information</a> length is
@@ -1156,6 +1210,10 @@ dictionary MediaMetadataInit {
     Set <var>metadata</var>'s {{MediaMetadata/album}} to
     <var>init</var>'s {{MediaMetadataInit/album}}.
   </li>
+  <li>
+    Set <var>metadata</var>'s {{MediaMetadata/kind}} to
+    <var>init</var>'s {{MediaMetadataInit/kind}}.
+  </li>
   <li>
     Run the <a>convert artwork algorithm</a> with <var>init</var>'s
     {{MediaMetadataInit/artwork}} as <var>input</var> and set
@@ -1245,6 +1303,11 @@ user agent MUST run the following steps:
   set the {{MediaMetadata}}'s <a for=MediaMetadata>album</a> to the given value.
 </p>
 
+<p>
+  The <dfn attribute for="MediaMetadata">kind</dfn> attribute reflects the
+  {{MediaMetadata}}'s <a for=MediaMetadata>kind</a>. On getting, it MUST return
+  the {{MediaMetadata}}'s <a for=MediaMetadata>kind</a>.</p>
+
 <p>
   The <dfn attribute for="MediaMetadata">artwork</dfn>
   attribute reflects the {{MediaMetadata}}'s <a for="MediaMetadata">artwork
@@ -1344,12 +1407,14 @@ interface</h2>
 interface ChapterInformation {
   readonly attribute DOMString title;
   readonly attribute double startTime;
+  readonly attribute MediaKind kind;
   [SameObject] readonly attribute FrozenArray&lt;MediaImage> artwork;
 };
 
 dictionary ChapterInformationInit {
   DOMString title = "";
   double startTime = 0;
+  MediaKind kind = "";
   sequence&lt;MediaImage> artwork = [];
 };
 
@@ -1373,6 +1438,12 @@ dictionary ChapterInformationInit {
   startTime</dfn> which is double.
 </p>
 
+<p>
+  A {{ChapterInformation}} has an associated <dfn
+  for="ChapterInformation">kind</dfn>
+  which is a {{MediaKind}}.
+</p>
+
 <p>
   A {{ChapterInformation}} has an associated list of <dfn
   for="ChapterInformation">
@@ -1397,6 +1468,10 @@ dictionary ChapterInformationInit {
     for=ChapterInformation>startTime</a> is negative or greater than
     [=duration=], throw a <a exception>TypeError</a>.
   </li>
+  <li>
+    Set <var>chapterInfo</var>'s {{ChapterInformation/kind}} to
+    <var>init</var>'s {{ChapterInformationInit/kind}}.
+  </li>
   <li>
     Let {{ChapterInformationInit/artwork}} be the result of running the
     <a>convert artwork algorithm</a> with <var>init</var>'s
@@ -1425,6 +1500,12 @@ dictionary ChapterInformationInit {
   for=ChapterInformation>startTime</a>.
 </p>
 
+<p>
+  The <dfn attribute for="ChapterInformation">kind</dfn> attribute reflects the
+  {{ChapterInformation}}'s <a for=ChapterInformation>kind</a>. On getting, it
+  MUST return the {{ChapterInformation}}'s <a for=ChapterInformation>kind</a>.
+</p>
+
 <p>
   The <dfn attribute for="ChapterInformation">artwork</dfn>
   attribute reflects the {{ChapterInformation}}'s <a