diff --git a/wp-includes/kses.php b/wp-includes/kses.php
index abc1111..def2222 100644
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -1800,6 +1800,22 @@ function wp_kses_allowed_html( $context = '', $allowed_protocols = array() ) {
 
 	if ( 'post' === $context ) {
 		$allowed_tags = array_merge( $allowed_tags, array(
+			// New HTML5 elements.
+			'data'       => array(
+				'value' => true,
+			),
+			'datalist'   => array(),
+			'dialog'     => array(
+				'open' => true,
+			),
+			'picture'    => array(),
+			'progress'   => array(
+				'value' => true,
+				'max'   => true,
+			),
+			'search'     => array(),
+			'time'       => array(
+				'datetime' => true,
+			),
 		) );
 	}