--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/block-supports/position.php	Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,151 @@
+<?php
+/**
+ * Position block support flag.
+ *
+ * @package WordPress
+ * @since 6.2.0
+ */
+
+/**
+ * Registers the style block attribute for block types that support it.
+ *
+ * @since 6.2.0
+ * @access private
+ *
+ * @param WP_Block_Type $block_type Block Type.
+ */
+function wp_register_position_support( $block_type ) {
+	$has_position_support = block_has_support( $block_type, 'position', false );
+
+	// Set up attributes and styles within that if needed.
+	if ( ! $block_type->attributes ) {
+		$block_type->attributes = array();
+	}
+
+	if ( $has_position_support && ! array_key_exists( 'style', $block_type->attributes ) ) {
+		$block_type->attributes['style'] = array(
+			'type' => 'object',
+		);
+	}
+}
+
+/**
+ * Renders position styles to the block wrapper.
+ *
+ * @since 6.2.0
+ * @access private
+ *
+ * @param  string $block_content Rendered block content.
+ * @param  array  $block         Block object.
+ * @return string                Filtered block content.
+ */
+function wp_render_position_support( $block_content, $block ) {
+	$block_type           = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
+	$has_position_support = block_has_support( $block_type, 'position', false );
+
+	if (
+		! $has_position_support ||
+		empty( $block['attrs']['style']['position'] )
+	) {
+		return $block_content;
+	}
+
+	$global_settings          = wp_get_global_settings();
+	$theme_has_sticky_support = isset( $global_settings['position']['sticky'] ) ? $global_settings['position']['sticky'] : false;
+	$theme_has_fixed_support  = isset( $global_settings['position']['fixed'] ) ? $global_settings['position']['fixed'] : false;
+
+	// Only allow output for position types that the theme supports.
+	$allowed_position_types = array();
+	if ( true === $theme_has_sticky_support ) {
+		$allowed_position_types[] = 'sticky';
+	}
+	if ( true === $theme_has_fixed_support ) {
+		$allowed_position_types[] = 'fixed';
+	}
+
+	$style_attribute = isset( $block['attrs']['style'] ) ? $block['attrs']['style'] : null;
+	$class_name      = wp_unique_id( 'wp-container-' );
+	$selector        = ".$class_name";
+	$position_styles = array();
+	$position_type   = isset( $style_attribute['position']['type'] ) ? $style_attribute['position']['type'] : '';
+	$wrapper_classes = array();
+
+	if (
+		in_array( $position_type, $allowed_position_types, true )
+	) {
+		$wrapper_classes[] = $class_name;
+		$wrapper_classes[] = 'is-position-' . $position_type;
+		$sides             = array( 'top', 'right', 'bottom', 'left' );
+
+		foreach ( $sides as $side ) {
+			$side_value = isset( $style_attribute['position'][ $side ] ) ? $style_attribute['position'][ $side ] : null;
+			if ( null !== $side_value ) {
+				/*
+				 * For fixed or sticky top positions,
+				 * ensure the value includes an offset for the logged in admin bar.
+				 */
+				if (
+					'top' === $side &&
+					( 'fixed' === $position_type || 'sticky' === $position_type )
+				) {
+					// Ensure 0 values can be used in `calc()` calculations.
+					if ( '0' === $side_value || 0 === $side_value ) {
+						$side_value = '0px';
+					}
+
+					// Ensure current side value also factors in the height of the logged in admin bar.
+					$side_value = "calc($side_value + var(--wp-admin--admin-bar--position-offset, 0px))";
+				}
+
+				$position_styles[] =
+					array(
+						'selector'     => $selector,
+						'declarations' => array(
+							$side => $side_value,
+						),
+					);
+			}
+		}
+
+		$position_styles[] =
+			array(
+				'selector'     => $selector,
+				'declarations' => array(
+					'position' => $position_type,
+					'z-index'  => '10',
+				),
+			);
+	}
+
+	if ( ! empty( $position_styles ) ) {
+		/*
+		 * Add to the style engine store to enqueue and render position styles.
+		 */
+		wp_style_engine_get_stylesheet_from_css_rules(
+			$position_styles,
+			array(
+				'context'  => 'block-supports',
+				'prettify' => false,
+			)
+		);
+
+		// Inject class name to block container markup.
+		$content = new WP_HTML_Tag_Processor( $block_content );
+		$content->next_tag();
+		foreach ( $wrapper_classes as $class ) {
+			$content->add_class( $class );
+		}
+		return (string) $content;
+	}
+
+	return $block_content;
+}
+
+// Register the block support.
+WP_Block_Supports::get_instance()->register(
+	'position',
+	array(
+		'register_attribute' => 'wp_register_position_support',
+	)
+);
+add_filter( 'render_block', 'wp_render_position_support', 10, 2 );