KSES: Add background-repeat to the list of safe CSS properties.

Follow-up to [45242], [46235].

Props andrewserong, ramonopoly, mukesh27.
Fixes #60132.

git-svn-id: https://develop.svn.wordpress.org/trunk@57228 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/kses.php

@@ -2303,6 +2303,7 @@ function kses_init() {
  * @since 6.3.0 Extended support for `filter` to accept a URL and added support for repeat().
  *              Added support for `box-shadow`.
  * @since 6.4.0 Added support for `writing-mode`.
+ * @since 6.5.0 Added support for `background-repeat`.
  *
  * @param string $css        A string of CSS rules.
  * @param string $deprecated Not used.
@@ -2334,6 +2335,7 @@ function safecss_filter_attr( $css, $deprecated = '' ) {
 			'background-color',
 			'background-image',
 			'background-position',
+			'background-repeat',
 			'background-size',
 			'background-attachment',
 			'background-blend-mode',

tests/phpunit/tests/kses.php

@@ -938,6 +938,8 @@ public function test_wp_kses_attr_no_attributes_allowed_with_false() {
 	 * @ticket 55966
 	 * @ticket 56122
 	 * @ticket 58551
+	 * @ticket 60132
+	 *
 	 * @dataProvider data_safecss_filter_attr
 	 *
 	 * @param string $css      A string of CSS rules.
@@ -1346,6 +1348,11 @@ public function data_safecss_filter_attr() {
 				'css'      => 'writing-mode: vertical-rl',
 				'expected' => 'writing-mode: vertical-rl',
 			),
+			// `background-repeat` introduced in 6.5.
+			array(
+				'css'      => 'background-repeat: no-repeat',
+				'expected' => 'background-repeat: no-repeat',
+			),
 		);
 	}