diff --git a/wp-includes/media.php b/wp-includes/media.php
index 6c4fce40ea..15a608b0e5 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -2313,10 +2313,12 @@ function wp_audio_shortcode( $attr, $content = '' ) {
 	 * Filters the class attribute for the audio shortcode output container.
 	 *
 	 * @since 3.6.0
+	 * @since 4.9.0 The `$atts` parameter was added.
 	 *
 	 * @param string $class CSS class or list of space-separated classes.
+	 * @param array  $atts  Array of audio shortcode attributes.
 	 */
-	$atts['class'] = apply_filters( 'wp_audio_shortcode_class', $atts['class'] );
+	$atts['class'] = apply_filters( 'wp_audio_shortcode_class', $atts['class'], $atts );
 
 	$html_atts = array(
 		'class'    => $atts['class'],
@@ -2443,7 +2445,7 @@ function wp_video_shortcode( $attr, $content = '' ) {
 	 * @see wp_video_shortcode()
 	 *
 	 * @param string $html     Empty variable to be replaced with shortcode markup.
-	 * @param array  $attr     Attributes of the video shortcode.
+	 * @param array  $attr     Attributes of the shortcode. @see wp_video_shortcode()
 	 * @param string $content  Video shortcode content.
 	 * @param int    $instance Unique numeric ID of this video shortcode instance.
 	 */
@@ -2569,10 +2571,12 @@ function wp_video_shortcode( $attr, $content = '' ) {
 	 * Filters the class attribute for the video shortcode output container.
 	 *
 	 * @since 3.6.0
+	 * @since 4.9.0 The `$atts` parameter was added.
 	 *
 	 * @param string $class CSS class or list of space-separated classes.
+	 * @param array  $atts  Array of video shortcode attributes.
 	 */
-	$atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'] );
+	$atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'], $atts );
 
 	$html_atts = array(
 		'class'    => $atts['class'],
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 05d7395b9e..59bbed7f43 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41233';
+$wp_version = '4.9-alpha-41234';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.