diff --git a/src/wp-includes/kses.php b/src/wp-includes/kses.php
index 91bb04260a..03a4881fb3 100644
--- a/src/wp-includes/kses.php
+++ b/src/wp-includes/kses.php
@@ -249,6 +249,11 @@ if ( ! CUSTOM_TAGS ) {
 		'q'          => array(
 			'cite' => true,
 		),
+		'rb'         => array(),
+		'rp'         => array(),
+		'rt'         => array(),
+		'rtc'        => array(),
+		'ruby'       => array(),
 		's'          => array(),
 		'samp'       => array(),
 		'span'       => array(
diff --git a/tests/phpunit/tests/kses.php b/tests/phpunit/tests/kses.php
index 57dc2ae402..fc6882242f 100644
--- a/tests/phpunit/tests/kses.php
+++ b/tests/phpunit/tests/kses.php
@@ -861,7 +861,7 @@ EOF;
 	/**
 	 * @ticket 34063
 	 */
-	public function test_bdo() {
+	public function test_bdo_tag_allowed() {
 		global $allowedposttags;
 
 		$input = '<p>This is <bdo dir="rtl">a BDO tag</bdo>. Weird, <bdo dir="ltr">right?</bdo></p>';
@@ -869,10 +869,21 @@ EOF;
 		$this->assertSame( $input, wp_kses( $input, $allowedposttags ) );
 	}
 
+	/**
+	 * @ticket 54698
+	 */
+	public function test_ruby_tag_allowed() {
+		global $allowedposttags;
+
+		$input = '<ruby>✶<rp>: </rp><rt>Star</rt><rp>, </rp><rt lang="fr">Étoile</rt><rp>.</rp></ruby>';
+
+		$this->assertSame( $input, wp_kses( $input, $allowedposttags ) );
+	}
+
 	/**
 	 * @ticket 35079
 	 */
-	public function test_ol_reversed() {
+	public function test_ol_reversed_attribute_allowed() {
 		global $allowedposttags;
 
 		$input = '<ol reversed="reversed"><li>Item 1</li><li>Item 2</li><li>Item 3</li></ol>';