Themes: Adds outline CSS properties support in theme.json.

Adds the ability to define outline CSS properties for elements and blocks within `theme.json` to render `outline-color`, `outline-offset`, `outline-style`, and `outline-width` styles.

Originally developed and tested in [https://github.com/WordPress/gutenberg/pull/43526 Gutenberg PR 43526].

Props onemaggie, hellofromTonya, audrasjb, ironprogrammer.
Fixes #57354.
Built from https://develop.svn.wordpress.org/trunk@55008


git-svn-id: http://core.svn.wordpress.org/trunk@54541 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme-json.php

@@ -192,6 +192,8 @@ class WP_Theme_JSON {
 	 * @since 6.1.0 Added the `border-*-color`, `border-*-width`, `border-*-style`,
 	 *              `--wp--style--root--padding-*`, and `box-shadow` properties,
 	 *              removed the `--wp--style--block-gap` property.
+	 * @since 6.2.0 Added `outline-*` properties.
+	 *
 	 * @var array
 	 */
 	const PROPERTIES_METADATA = array(
@@ -229,6 +231,10 @@ class WP_Theme_JSON {
 		'margin-right'                      => array( 'spacing', 'margin', 'right' ),
 		'margin-bottom'                     => array( 'spacing', 'margin', 'bottom' ),
 		'margin-left'                       => array( 'spacing', 'margin', 'left' ),
+		'outline-color'                     => array( 'outline', 'color' ),
+		'outline-offset'                    => array( 'outline', 'offset' ),
+		'outline-style'                     => array( 'outline', 'style' ),
+		'outline-width'                     => array( 'outline', 'width' ),
 		'padding'                           => array( 'spacing', 'padding' ),
 		'padding-top'                       => array( 'spacing', 'padding', 'top' ),
 		'padding-right'                     => array( 'spacing', 'padding', 'right' ),
@@ -352,6 +358,8 @@ class WP_Theme_JSON {
 	 * @since 6.1.0 Added new side properties for `border`,
 	 *              added new property `shadow`,
 	 *              updated `blockGap` to be allowed at any level.
+	 * @since 6.2.0 Added `outline` properties.
+	 *
 	 * @var array
 	 */
 	const VALID_STYLES = array(
@@ -374,6 +382,12 @@ class WP_Theme_JSON {
 			'duotone' => null,
 		),
 		'shadow'     => null,
+		'outline'    => array(
+			'color'  => null,
+			'offset' => null,
+			'style'  => null,
+			'width'  => null,
+		),
 		'spacing'    => array(
 			'margin'   => null,
 			'padding'  => null,

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-alpha-55007';
+$wp_version = '6.2-alpha-55008';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.