Editorial: correct plurality

Author: j9t

source

@@ -33515,7 +33515,7 @@ interface <dfn interface>HTMLVideoElement</dfn> : <span>HTMLMediaElement</span>
   of being displayed fullscreen or in an independent resizable window.</p>
 
   <p class="note">The absence of the <code data-x="attr-video-playsinline">playsinline</code>
-  attributes does not imply that the video will display fullscreen by default. Indeed, most user
+  attribute does not imply that the video will display fullscreen by default. Indeed, most user
   agents have chosen to play all videos inline by default, and in such user agents the <code
   data-x="attr-video-playsinline">playsinline</code> attribute has no effect.</p>