Global styles: add support for select or dropdown elements

backport-changelog/6.9/8961.md

@@ -0,0 +1,3 @@
+https://github.com/WordPress/wordpress-develop/pull/8961
+
+* https://github.com/WordPress/gutenberg/pull/70379

lib/class-wp-theme-json-gutenberg.php

@@ -611,6 +611,7 @@ class WP_Theme_JSON_Gutenberg {
 		// The block classes are necessary to target older content that won't use the new class names.
 		'caption' => '.wp-element-caption, .wp-block-audio figcaption, .wp-block-embed figcaption, .wp-block-gallery figcaption, .wp-block-image figcaption, .wp-block-table figcaption, .wp-block-video figcaption',
 		'cite'    => 'cite',
+		'select'  => 'select',
 	);
 
 	const __EXPERIMENTAL_ELEMENT_CLASS_NAMES = array(

packages/blocks/src/api/constants.js

@@ -284,6 +284,7 @@ export const __EXPERIMENTAL_ELEMENTS = {
 	caption:
 		'.wp-element-caption, .wp-block-audio figcaption, .wp-block-embed figcaption, .wp-block-gallery figcaption, .wp-block-image figcaption, .wp-block-table figcaption, .wp-block-video figcaption',
 	cite: 'cite',
+	select: 'select',
 };
 
 // These paths may have three origins, custom, theme, and default,

schemas/json/theme.json

@@ -1836,6 +1836,9 @@
 				},
 				"cite": {
 					"$ref": "#/definitions/stylesPropertiesComplete"
+				},
+				"select": {
+					"$ref": "#/definitions/stylesPropertiesComplete"
 				}
 			},
 			"additionalProperties": false