Twenty Seventeen: Accessibility: Add missing focus state for native audio and video embeds.

Props kjellr, karlgroves.
Fixes #47190.
Built from https://develop.svn.wordpress.org/trunk@45425


git-svn-id: http://core.svn.wordpress.org/trunk@45236 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentyseventeen/style.css

@@ -2846,6 +2846,11 @@ img.alignright {
 	padding: 0;
 }
 
+audio:focus,
+video:focus {
+	outline: thin dotted;
+}
+
 /* Make sure embeds and iframes fit their containers. */
 
 embed,

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45424';
+$wp_version = '5.3-alpha-45425';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.