anchor.diff:  However, the video is muted by default in background mode.
   If your video has sound, and you want that sound to be heard, you must specify the `data-volume` attribute.
   
  -This plugin also recognizes the following custom attributes:
  -
  -data-rewind _(type: boolean, default: false)_::
  -If this attribute is present, the video is restarted each time playback is triggered.
  -
  -data-volume _(type: integer)_::
  -This attribute can be used to set the volume of the video.
  -The value must be an integer between 0 and 10, where 0 is muted and 10 is full volume.
  -Any value outside this range will be coerced to the closest range limit.
  -If this attribute is not specified, the volume of the video is not modified.
  +This plugin also recognizes the custom attributes defined in <<custom-attributes-for-media-elements>>.
   
   ==== Example
   
  
positive.code: * Vimeo video
  * YouTube video
  * Animated SVG (embedded using the `<object>` element)
  * Animated GIF (image ending in `.gif`)
  
  The following sections describe how each media type is handled.
  
  
negative.code: ==== Options
  
  You can use (most of) the https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video[built-in attributes] supported by the `<video>` element, such as `controls`, `preload` and `loop`.
  
  CAUTION: Using the `autoplay` attribute is not recommended since it conflicts with the behavior of this plugin.
  
  In addition to the built-in attributes, this plugin also recognizes the custom attributes defined in <<custom-attributes-for-media-elements>>.
  
  ==== Example
  
  