diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 86f6de94a3647..22ef6d086d2f0 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -182,6 +182,7 @@ function register_block_script_module_id( $metadata, $field_name, $index = 0 ) {
 		( isset( $metadata['supports']['interactivity']['interactive'] ) && true === $metadata['supports']['interactivity']['interactive'] )
 	) {
 		$args['fetchpriority'] = 'low';
+		$args['in_footer']     = true;
 	}
 
 	wp_register_script_module(
diff --git a/src/wp-includes/class-wp-script-modules.php b/src/wp-includes/class-wp-script-modules.php
index 932fa984db018..838c0eaf9cdf3 100644
--- a/src/wp-includes/class-wp-script-modules.php
+++ b/src/wp-includes/class-wp-script-modules.php
@@ -18,7 +18,7 @@ class WP_Script_Modules {
 	 * Holds the registered script modules, keyed by script module identifier.
 	 *
 	 * @since 6.5.0
-	 * @var array[]
+	 * @var array<string, array<string, mixed>>
 	 */
 	private $registered = array();
 
@@ -30,6 +30,14 @@ class WP_Script_Modules {
 	 */
 	private $queue = array();
 
+	/**
+	 * Holds the script module identifiers that have been printed.
+	 *
+	 * @since 6.9.0
+	 * @var string[]
+	 */
+	private $done = array();
+
 	/**
 	 * Tracks whether the @wordpress/a11y script module is available.
 	 *
@@ -50,6 +58,18 @@ class WP_Script_Modules {
 	 */
 	private $dependents_map = array();
 
+	/**
+	 * Holds the valid values for fetchpriority.
+	 *
+	 * @since 6.9.0
+	 * @var string[]
+	 */
+	private $priorities = array(
+		'low',
+		'auto',
+		'high',
+	);
+
 	/**
 	 * Registers the script module if no script module with that script module
 	 * identifier has already been registered.
@@ -84,10 +104,16 @@ class WP_Script_Modules {
 	 * @param array             $args     {
 	 *     Optional. An array of additional args. Default empty array.
 	 *
+	 *     @type bool                $in_footer     Whether to print the script module in the footer. Only relevant to block themes. Default 'false'. Optional.
 	 *     @type 'auto'|'low'|'high' $fetchpriority Fetch priority. Default 'auto'. Optional.
 	 * }
 	 */
 	public function register( string $id, string $src, array $deps = array(), $version = false, array $args = array() ) {
+		if ( '' === $id ) {
+			_doing_it_wrong( __METHOD__, __( 'Non-empty string required for id.' ), '6.9.0' );
+			return;
+		}
+
 		if ( ! isset( $this->registered[ $id ] ) ) {
 			$dependencies = array();
 			foreach ( $deps as $dependency ) {
@@ -110,6 +136,8 @@ public function register( string $id, string $src, array $deps = array(), $versi
 				}
 			}
 
+			$in_footer = isset( $args['in_footer'] ) && (bool) $args['in_footer'];
+
 			$fetchpriority = 'auto';
 			if ( isset( $args['fetchpriority'] ) ) {
 				if ( $this->is_valid_fetchpriority( $args['fetchpriority'] ) ) {
@@ -132,6 +160,7 @@ public function register( string $id, string $src, array $deps = array(), $versi
 				'src'           => $src,
 				'version'       => $version,
 				'dependencies'  => $dependencies,
+				'in_footer'     => $in_footer,
 				'fetchpriority' => $fetchpriority,
 			);
 		}
@@ -157,7 +186,7 @@ public function get_queue(): array {
 	 * @return bool Whether valid fetchpriority.
 	 */
 	private function is_valid_fetchpriority( $priority ): bool {
-		return in_array( $priority, array( 'auto', 'low', 'high' ), true );
+		return in_array( $priority, $this->priorities, true );
 	}
 
 	/**
@@ -192,6 +221,25 @@ public function set_fetchpriority( string $id, string $priority ): bool {
 		return true;
 	}
 
+	/**
+	 * Sets whether a script module should be printed in the footer.
+	 *
+	 * This is only relevant in block themes.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param string           $id        Script module identifier.
+	 * @param bool             $in_footer Whether to print in the footer.
+	 * @return bool Whether setting the printing location was successful.
+	 */
+	public function set_in_footer( string $id, bool $in_footer ): bool {
+		if ( ! isset( $this->registered[ $id ] ) ) {
+			return false;
+		}
+		$this->registered[ $id ]['in_footer'] = $in_footer;
+		return true;
+	}
+
 	/**
 	 * Marks the script module to be enqueued in the page.
 	 *
@@ -228,10 +276,16 @@ public function set_fetchpriority( string $id, string $priority ): bool {
 	 * @param array             $args     {
 	 *     Optional. An array of additional args. Default empty array.
 	 *
+	 *     @type bool                $in_footer     Whether to print the script module in the footer. Only relevant to block themes. Default 'false'. Optional.
 	 *     @type 'auto'|'low'|'high' $fetchpriority Fetch priority. Default 'auto'. Optional.
 	 * }
 	 */
 	public function enqueue( string $id, string $src = '', array $deps = array(), $version = false, array $args = array() ) {
+		if ( '' === $id ) {
+			_doing_it_wrong( __METHOD__, __( 'Non-empty string required for id.' ), '6.9.0' );
+			return;
+		}
+
 		if ( ! in_array( $id, $this->queue, true ) ) {
 			$this->queue[] = $id;
 		}
@@ -274,9 +328,20 @@ public function deregister( string $id ) {
 	 * @since 6.5.0
 	 */
 	public function add_hooks() {
-		$position = wp_is_block_theme() ? 'wp_head' : 'wp_footer';
+		$is_block_theme = wp_is_block_theme();
+		$position       = $is_block_theme ? 'wp_head' : 'wp_footer';
 		add_action( $position, array( $this, 'print_import_map' ) );
-		add_action( $position, array( $this, 'print_enqueued_script_modules' ) );
+		if ( $is_block_theme ) {
+			/*
+			 * Modules can only be printed in the head for block themes because only with
+			 * block themes will import map be fully populated by modules discovered by
+			 * rendering the block template. In classic themes, modules are enqueued during
+			 * template rendering, thus the import map must be printed in the footer,
+			 * followed by all enqueued modules.
+			 */
+			add_action( 'wp_head', array( $this, 'print_head_enqueued_script_modules' ) );
+		}
+		add_action( 'wp_footer', array( $this, 'print_enqueued_script_modules' ) );
 		add_action( $position, array( $this, 'print_script_module_preloads' ) );
 
 		add_action( 'admin_print_footer_scripts', array( $this, 'print_import_map' ) );
@@ -295,22 +360,20 @@ public function add_hooks() {
 	 * @since 6.9.0
 	 *
 	 * @param string[] $ids Script module IDs.
-	 * @return string Highest fetch priority for the provided script module IDs.
+	 * @return 'auto'|'low'|'high' Highest fetch priority for the provided script module IDs.
 	 */
 	private function get_highest_fetchpriority( array $ids ): string {
-		static $priorities   = array(
-			'low',
-			'auto',
-			'high',
-		);
-		$high_priority_index = count( $priorities ) - 1;
+		static $high_priority_index = null;
+		if ( null === $high_priority_index ) {
+			$high_priority_index = count( $this->priorities ) - 1;
+		}
 
 		$highest_priority_index = 0;
 		foreach ( $ids as $id ) {
 			if ( isset( $this->registered[ $id ] ) ) {
-				$highest_priority_index = max(
+				$highest_priority_index = (int) max(
 					$highest_priority_index,
-					array_search( $this->registered[ $id ]['fetchpriority'], $priorities, true )
+					(int) array_search( $this->registered[ $id ]['fetchpriority'], $this->priorities, true )
 				);
 				if ( $high_priority_index === $highest_priority_index ) {
 					break;
@@ -318,33 +381,85 @@ private function get_highest_fetchpriority( array $ids ): string {
 			}
 		}
 
-		return $priorities[ $highest_priority_index ];
+		return $this->priorities[ $highest_priority_index ];
 	}
 
 	/**
-	 * Prints the enqueued script modules using script tags with type="module"
-	 * attributes.
+	 * Prints the enqueued script modules in head.
+	 *
+	 * This is only used in block themes.
+	 *
+	 * @since 6.9.0
+	 */
+	public function print_head_enqueued_script_modules() {
+		foreach ( $this->get_sorted_dependencies( $this->queue ) as $id ) {
+			if (
+				isset( $this->registered[ $id ] ) &&
+				! $this->registered[ $id ]['in_footer']
+			) {
+				// If any dependency is set to be printed in footer, skip printing this module in head.
+				$dependencies = $this->get_dependencies( array( $id ) );
+				foreach ( $dependencies as $dependency_id ) {
+					if (
+						in_array( $dependency_id, $this->queue, true ) &&
+						isset( $this->registered[ $dependency_id ] ) &&
+						$this->registered[ $dependency_id ]['in_footer']
+					) {
+						continue 2;
+					}
+				}
+				$this->print_script_module( $id );
+			}
+		}
+	}
+
+	/**
+	 * Prints the enqueued script modules in footer.
 	 *
 	 * @since 6.5.0
 	 */
 	public function print_enqueued_script_modules() {
-		foreach ( $this->get_marked_for_enqueue() as $id => $script_module ) {
-			$args = array(
-				'type' => 'module',
-				'src'  => $this->get_src( $id ),
-				'id'   => $id . '-js-module',
-			);
+		foreach ( $this->get_sorted_dependencies( $this->queue ) as $id ) {
+			$this->print_script_module( $id );
+		}
+	}
 
-			$dependents    = $this->get_recursive_dependents( $id );
-			$fetchpriority = $this->get_highest_fetchpriority( array_merge( array( $id ), $dependents ) );
-			if ( 'auto' !== $fetchpriority ) {
-				$args['fetchpriority'] = $fetchpriority;
-			}
-			if ( $fetchpriority !== $script_module['fetchpriority'] ) {
-				$args['data-wp-fetchpriority'] = $script_module['fetchpriority'];
-			}
-			wp_print_script_tag( $args );
+	/**
+	 * Prints the enqueued script module using script tags with type="module"
+	 * attributes.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param string $id The script module identifier.
+	 */
+	private function print_script_module( string $id ) {
+		if ( in_array( $id, $this->done, true ) || ! in_array( $id, $this->queue, true ) ) {
+			return;
 		}
+
+		$this->done[] = $id;
+
+		$src = $this->get_src( $id );
+		if ( '' === $src ) {
+			return;
+		}
+
+		$attributes = array(
+			'type' => 'module',
+			'src'  => $src,
+			'id'   => $id . '-js-module',
+		);
+
+		$script_module = $this->registered[ $id ];
+		$dependents    = $this->get_recursive_dependents( $id );
+		$fetchpriority = $this->get_highest_fetchpriority( array_merge( array( $id ), $dependents ) );
+		if ( 'auto' !== $fetchpriority ) {
+			$attributes['fetchpriority'] = $fetchpriority;
+		}
+		if ( $fetchpriority !== $script_module['fetchpriority'] ) {
+			$attributes['data-wp-fetchpriority'] = $script_module['fetchpriority'];
+		}
+		wp_print_script_tag( $attributes );
 	}
 
 	/**
@@ -356,24 +471,32 @@ public function print_enqueued_script_modules() {
 	 * @since 6.5.0
 	 */
 	public function print_script_module_preloads() {
-		foreach ( $this->get_dependencies( array_unique( $this->queue ), array( 'static' ) ) as $id => $script_module ) {
+		$dependency_ids = $this->get_sorted_dependencies( $this->queue, array( 'static' ) );
+		foreach ( $dependency_ids as $id ) {
 			// Don't preload if it's marked for enqueue.
-			if ( ! in_array( $id, $this->queue, true ) ) {
-				$enqueued_dependents   = array_intersect( $this->get_recursive_dependents( $id ), $this->queue );
-				$highest_fetchpriority = $this->get_highest_fetchpriority( $enqueued_dependents );
-				printf(
-					'<link rel="modulepreload" href="%s" id="%s"',
-					esc_url( $this->get_src( $id ) ),
-					esc_attr( $id . '-js-modulepreload' )
-				);
-				if ( 'auto' !== $highest_fetchpriority ) {
-					printf( ' fetchpriority="%s"', esc_attr( $highest_fetchpriority ) );
-				}
-				if ( $highest_fetchpriority !== $script_module['fetchpriority'] && 'auto' !== $script_module['fetchpriority'] ) {
-					printf( ' data-wp-fetchpriority="%s"', esc_attr( $script_module['fetchpriority'] ) );
-				}
-				echo ">\n";
+			if ( in_array( $id, $this->queue, true ) ) {
+				continue;
 			}
+
+			$src = $this->get_src( $id );
+			if ( '' === $src ) {
+				continue;
+			}
+
+			$enqueued_dependents   = array_intersect( $this->get_recursive_dependents( $id ), $this->queue );
+			$highest_fetchpriority = $this->get_highest_fetchpriority( $enqueued_dependents );
+			printf(
+				'<link rel="modulepreload" href="%s" id="%s"',
+				esc_url( $src ),
+				esc_attr( $id . '-js-modulepreload' )
+			);
+			if ( 'auto' !== $highest_fetchpriority ) {
+				printf( ' fetchpriority="%s"', esc_attr( $highest_fetchpriority ) );
+			}
+			if ( $highest_fetchpriority !== $this->registered[ $id ]['fetchpriority'] && 'auto' !== $this->registered[ $id ]['fetchpriority'] ) {
+				printf( ' data-wp-fetchpriority="%s"', esc_attr( $this->registered[ $id ]['fetchpriority'] ) );
+			}
+			echo ">\n";
 		}
 	}
 
@@ -386,7 +509,7 @@ public function print_import_map() {
 		$import_map = $this->get_import_map();
 		if ( ! empty( $import_map['imports'] ) ) {
 			wp_print_inline_script_tag(
-				wp_json_encode( $import_map, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
+				(string) wp_json_encode( $import_map, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
 				array(
 					'type' => 'importmap',
 					'id'   => 'wp-importmap',
@@ -405,8 +528,11 @@ public function print_import_map() {
 	 */
 	private function get_import_map(): array {
 		$imports = array();
-		foreach ( $this->get_dependencies( array_unique( $this->queue ) ) as $id => $script_module ) {
-			$imports[ $id ] = $this->get_src( $id );
+		foreach ( $this->get_dependencies( $this->queue ) as $id ) {
+			$src = $this->get_src( $id );
+			if ( '' !== $src ) {
+				$imports[ $id ] = $src;
+			}
 		}
 		return array( 'imports' => $imports );
 	}
@@ -414,6 +540,9 @@ private function get_import_map(): array {
 	/**
 	 * Retrieves the list of script modules marked for enqueue.
 	 *
+	 * Even though this is a private method and is unused in core, there are ecosystem plugins accessing it via the
+	 * Reflection API. The ecosystem should rather use {@see self::get_queue()}.
+	 *
 	 * @since 6.5.0
 	 *
 	 * @return array<string, array> Script modules marked for enqueue, keyed by script module identifier.
@@ -426,8 +555,7 @@ private function get_marked_for_enqueue(): array {
 	}
 
 	/**
-	 * Retrieves all the dependencies for the given script module identifiers,
-	 * filtered by import types.
+	 * Retrieves all the dependencies for the given script module identifiers, filtered by import types.
 	 *
 	 * It will consolidate an array containing a set of unique dependencies based
 	 * on the requested import types: 'static', 'dynamic', or both. This method is
@@ -437,29 +565,34 @@ private function get_marked_for_enqueue(): array {
 	 *
 	 * @param string[] $ids          The identifiers of the script modules for which to gather dependencies.
 	 * @param string[] $import_types Optional. Import types of dependencies to retrieve: 'static', 'dynamic', or both.
-	 *                               Default is both.
-	 * @return array[] List of dependencies, keyed by script module identifier.
+	 *                                         Default is both.
+	 * @return string[] List of IDs for script module dependencies.
 	 */
 	private function get_dependencies( array $ids, array $import_types = array( 'static', 'dynamic' ) ): array {
-		return array_reduce(
-			$ids,
-			function ( $dependency_script_modules, $id ) use ( $import_types ) {
-				$dependencies = array();
-				if ( isset( $this->registered[ $id ] ) ) {
-					foreach ( $this->registered[ $id ]['dependencies'] as $dependency ) {
-						if (
-							in_array( $dependency['import'], $import_types, true ) &&
-							isset( $this->registered[ $dependency['id'] ] ) &&
-							! isset( $dependency_script_modules[ $dependency['id'] ] )
-						) {
-							$dependencies[ $dependency['id'] ] = $this->registered[ $dependency['id'] ];
-						}
-					}
+		$all_dependencies = array();
+		$id_queue         = $ids;
+
+		while ( ! empty( $id_queue ) ) {
+			$id = array_shift( $id_queue );
+			if ( ! isset( $this->registered[ $id ] ) ) {
+				continue;
+			}
+
+			foreach ( $this->registered[ $id ]['dependencies'] as $dependency ) {
+				if (
+					! isset( $all_dependencies[ $dependency['id'] ] ) &&
+					in_array( $dependency['import'], $import_types, true ) &&
+					isset( $this->registered[ $dependency['id'] ] )
+				) {
+					$all_dependencies[ $dependency['id'] ] = true;
+
+					// Add this dependency to the list to get dependencies for.
+					$id_queue[] = $dependency['id'];
 				}
-				return array_merge( $dependency_script_modules, $dependencies, $this->get_dependencies( array_keys( $dependencies ), $import_types ) );
-			},
-			array()
-		);
+			}
+		}
+
+		return array_keys( $all_dependencies );
 	}
 
 	/**
@@ -506,29 +639,105 @@ private function get_dependents( string $id ): array {
 	 * @return string[] Script module IDs.
 	 */
 	private function get_recursive_dependents( string $id ): array {
-		$get = function ( string $id, array $checked = array() ) use ( &$get ): array {
+		$dependents = array();
+		$id_queue   = array( $id );
+		$processed  = array();
+
+		while ( ! empty( $id_queue ) ) {
+			$current_id = array_shift( $id_queue );
 
-			// If by chance an unregistered script module is checked or there is a recursive dependency, return early.
-			if ( ! isset( $this->registered[ $id ] ) || isset( $checked[ $id ] ) ) {
-				return array();
+			// Skip unregistered or already-processed script modules.
+			if ( ! isset( $this->registered[ $current_id ] ) || isset( $processed[ $current_id ] ) ) {
+				continue;
 			}
 
-			// Mark this script module as checked to guard against infinite recursion.
-			$checked[ $id ] = true;
+			// Mark as processed to guard against infinite loops from circular dependencies.
+			$processed[ $current_id ] = true;
 
-			$dependents = array();
-			foreach ( $this->get_dependents( $id ) as $dependent ) {
-				$dependents = array_merge(
-					$dependents,
-					array( $dependent ),
-					$get( $dependent, $checked )
-				);
+			// Find the direct dependents of the current script.
+			foreach ( $this->get_dependents( $current_id ) as $dependent_id ) {
+				// Only add the dependent if we haven't found it before.
+				if ( ! isset( $dependents[ $dependent_id ] ) ) {
+					$dependents[ $dependent_id ] = true;
+
+					// Add dependency to the queue.
+					$id_queue[] = $dependent_id;
+				}
 			}
+		}
 
-			return $dependents;
-		};
+		return array_keys( $dependents );
+	}
 
-		return array_unique( $get( $id ) );
+	/**
+	 * Sorts the given script module identifiers based on their dependencies.
+	 *
+	 * It will return a list of script module identifiers sorted in the order
+	 * they should be printed, so that dependencies are printed before the script
+	 * modules that depend on them.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param string[] $ids          The identifiers of the script modules to sort.
+	 * @param string[] $import_types Optional. Import types of dependencies to retrieve: 'static', 'dynamic', or both.
+	 *                                         Default is both.
+	 * @return string[] Sorted list of script module identifiers.
+	 */
+	private function get_sorted_dependencies( array $ids, array $import_types = array( 'static', 'dynamic' ) ): array {
+		$sorted = array();
+
+		foreach ( $ids as $id ) {
+			$this->sort_item_dependencies( $id, $import_types, $sorted );
+		}
+
+		return array_unique( $sorted );
+	}
+
+	/**
+	 * Recursively sorts the dependencies for a single script module identifier.
+	 *
+	 * @since 6.9.0
+	 *
+	 * @param string   $id           The identifier of the script module to sort.
+	 * @param string[] $import_types Optional. Import types of dependencies to retrieve: 'static', 'dynamic', or both.
+	 * @param string[] &$sorted      The array of sorted identifiers, passed by reference.
+	 * @return bool True on success, false on failure (e.g., missing dependency).
+	 */
+	private function sort_item_dependencies( string $id, array $import_types, array &$sorted ): bool {
+		// If already processed, don't do it again.
+		if ( in_array( $id, $sorted, true ) ) {
+			return true;
+		}
+
+		// If the item doesn't exist, fail.
+		if ( ! isset( $this->registered[ $id ] ) ) {
+			return false;
+		}
+
+		$dependency_ids = array();
+		foreach ( $this->registered[ $id ]['dependencies'] as $dependency ) {
+			if ( in_array( $dependency['import'], $import_types, true ) ) {
+				$dependency_ids[] = $dependency['id'];
+			}
+		}
+
+		// If the item requires dependencies that do not exist, fail.
+		if ( count( array_diff( $dependency_ids, array_keys( $this->registered ) ) ) > 0 ) {
+			return false;
+		}
+
+		// Recursively process dependencies.
+		foreach ( $dependency_ids as $dependency_id ) {
+			if ( ! $this->sort_item_dependencies( $dependency_id, $import_types, $sorted ) ) {
+				// A dependency failed to resolve, so this branch fails.
+				return false;
+			}
+		}
+
+		// All dependencies are sorted, so we can now add the current item.
+		$sorted[] = $id;
+
+		return true;
 	}
 
 	/**
@@ -551,10 +760,12 @@ private function get_src( string $id ): string {
 		$script_module = $this->registered[ $id ];
 		$src           = $script_module['src'];
 
-		if ( false === $script_module['version'] ) {
-			$src = add_query_arg( 'ver', get_bloginfo( 'version' ), $src );
-		} elseif ( null !== $script_module['version'] ) {
-			$src = add_query_arg( 'ver', $script_module['version'], $src );
+		if ( '' !== $src ) {
+			if ( false === $script_module['version'] ) {
+				$src = add_query_arg( 'ver', get_bloginfo( 'version' ), $src );
+			} elseif ( null !== $script_module['version'] ) {
+				$src = add_query_arg( 'ver', $script_module['version'], $src );
+			}
 		}
 
 		/**
@@ -566,6 +777,9 @@ private function get_src( string $id ): string {
 		 * @param string $id  Module identifier.
 		 */
 		$src = apply_filters( 'script_module_loader_src', $src, $id );
+		if ( ! is_string( $src ) ) {
+			$src = '';
+		}
 
 		return $src;
 	}
@@ -681,7 +895,7 @@ public function print_script_module_data(): void {
 				}
 
 				wp_print_inline_script_tag(
-					wp_json_encode(
+					(string) wp_json_encode(
 						$data,
 						$json_encode_flags
 					),
diff --git a/src/wp-includes/script-modules.php b/src/wp-includes/script-modules.php
index 82e7635f1c538..85331d7aaec01 100644
--- a/src/wp-includes/script-modules.php
+++ b/src/wp-includes/script-modules.php
@@ -64,6 +64,7 @@ function wp_script_modules(): WP_Script_Modules {
  * @param array             $args    {
  *     Optional. An array of additional args. Default empty array.
  *
+ *     @type bool                $in_footer     Whether to print the script module in the footer. Only relevant to block themes. Default 'false'. Optional.
  *     @type 'auto'|'low'|'high' $fetchpriority Fetch priority. Default 'auto'. Optional.
  * }
  */
@@ -107,6 +108,7 @@ function wp_register_script_module( string $id, string $src, array $deps = array
  * @param array             $args    {
  *     Optional. An array of additional args. Default empty array.
  *
+ *     @type bool                $in_footer     Whether to print the script module in the footer. Only relevant to block themes. Default 'false'. Optional.
  *     @type 'auto'|'low'|'high' $fetchpriority Fetch priority. Default 'auto'. Optional.
  * }
  */
@@ -183,9 +185,9 @@ function wp_default_script_modules() {
 
 		/*
 		 * The Interactivity API is designed with server-side rendering as its primary goal, so all of its script modules
-		 * should be loaded with low fetchpriority since they should not be needed in the critical rendering path.
-		 * Also, the @wordpress/a11y script module is intended to be used as a dynamic import dependency, in which case
-		 * the fetchpriority is irrelevant. See <https://make.wordpress.org/core/2024/10/14/updates-to-script-modules-in-6-7/>.
+		 * should be loaded with low fetchpriority and printed in the footer since they should not be needed in the
+		 * critical rendering path. Also, the @wordpress/a11y script module is intended to be used as a dynamic import
+		 * dependency, in which case the fetchpriority is irrelevant. See <https://make.wordpress.org/core/2024/10/14/updates-to-script-modules-in-6-7/>.
 		 * However, in case it is added as a static import dependency, the fetchpriority is explicitly set to be 'low'
 		 * since the module should not be involved in the critical rendering path, and if it is, its fetchpriority will
 		 * be bumped to match the fetchpriority of the dependent script.
@@ -197,6 +199,7 @@ function wp_default_script_modules() {
 			'@wordpress/a11y' === $script_module_id
 		) {
 			$args['fetchpriority'] = 'low';
+			$args['in_footer']     = true;
 		}
 
 		$path = includes_url( "js/dist/script-modules/{$file_name}" );
diff --git a/tests/phpunit/tests/script-modules/wpScriptModules.php b/tests/phpunit/tests/script-modules/wpScriptModules.php
index bec646b521bad..62f3551a50051 100644
--- a/tests/phpunit/tests/script-modules/wpScriptModules.php
+++ b/tests/phpunit/tests/script-modules/wpScriptModules.php
@@ -56,30 +56,38 @@ public function tear_down() {
 	 * @return array Enqueued script module URLs, keyed by script module identifier.
 	 */
 	public function get_enqueued_script_modules(): array {
-		$modules = array();
-
-		$p = new WP_HTML_Tag_Processor( get_echo( array( $this->script_modules, 'print_enqueued_script_modules' ) ) );
-		while ( $p->next_tag( array( 'tag' => 'SCRIPT' ) ) ) {
-			$this->assertSame( 'module', $p->get_attribute( 'type' ) );
-			$this->assertIsString( $p->get_attribute( 'id' ) );
-			$this->assertIsString( $p->get_attribute( 'src' ) );
-			$this->assertStringEndsWith( '-js-module', $p->get_attribute( 'id' ) );
+		$get_modules = function ( string $html, bool $in_footer ): array {
+			$modules = array();
+			$p       = new WP_HTML_Tag_Processor( $html );
+			while ( $p->next_tag( array( 'tag' => 'SCRIPT' ) ) ) {
+				$this->assertSame( 'module', $p->get_attribute( 'type' ) );
+				$this->assertIsString( $p->get_attribute( 'id' ) );
+				$this->assertIsString( $p->get_attribute( 'src' ) );
+				$this->assertStringEndsWith( '-js-module', $p->get_attribute( 'id' ) );
+
+				$id             = preg_replace( '/-js-module$/', '', (string) $p->get_attribute( 'id' ) );
+				$fetchpriority  = $p->get_attribute( 'fetchpriority' );
+				$modules[ $id ] = array_merge(
+					array(
+						'url'           => $p->get_attribute( 'src' ),
+						'fetchpriority' => is_string( $fetchpriority ) ? $fetchpriority : 'auto',
+						'in_footer'     => $in_footer,
+					),
+					...array_map(
+						static function ( $attribute_name ) use ( $p ) {
+							return array( $attribute_name => $p->get_attribute( $attribute_name ) );
+						},
+						$p->get_attribute_names_with_prefix( 'data-' )
+					)
+				);
+			}
+			return $modules;
+		};
 
-			$id             = preg_replace( '/-js-module$/', '', (string) $p->get_attribute( 'id' ) );
-			$fetchpriority  = $p->get_attribute( 'fetchpriority' );
-			$modules[ $id ] = array_merge(
-				array(
-					'url'           => $p->get_attribute( 'src' ),
-					'fetchpriority' => is_string( $fetchpriority ) ? $fetchpriority : 'auto',
-				),
-				...array_map(
-					static function ( $attribute_name ) use ( $p ) {
-						return array( $attribute_name => $p->get_attribute( $attribute_name ) );
-					},
-					$p->get_attribute_names_with_prefix( 'data-' )
-				)
-			);
-		}
+		$modules = array_merge(
+			$get_modules( get_echo( array( $this->script_modules, 'print_head_enqueued_script_modules' ) ), false ),
+			$get_modules( get_echo( array( $this->script_modules, 'print_enqueued_script_modules' ) ), true )
+		);
 
 		return $modules;
 	}
@@ -146,12 +154,44 @@ public function test_wp_script_modules() {
 		$this->assertSame( $this->script_modules, wp_script_modules() );
 	}
 
+	/**
+	 * Test wp_register_script_module() with empty ID.
+	 *
+	 * @ticket 63486
+	 *
+	 * @expectedIncorrectUsage WP_Script_Modules::register
+	 *
+	 * @covers ::wp_register_script_module
+	 * @covers WP_Script_Modules::register
+	 */
+	public function test_register_with_empty_id() {
+		wp_register_script_module( '', '/null-and-void.js' );
+		$this->assertArrayNotHasKey( '', $this->get_registered_script_modules( wp_script_modules() ) );
+	}
+
+	/**
+	 * Test wp_enqueue_script_module() with empty ID.
+	 *
+	 * @ticket 63486
+	 *
+	 * @expectedIncorrectUsage WP_Script_Modules::enqueue
+	 *
+	 * @covers ::wp_enqueue_script_module
+	 * @covers WP_Script_Modules::enqueue
+	 */
+	public function test_enqueue_with_empty_id() {
+		wp_enqueue_script_module( '', '/null-and-void.js' );
+		$this->assertArrayNotHasKey( '', $this->get_registered_script_modules( wp_script_modules() ) );
+		$this->assertNotContains( '', wp_script_modules()->get_queue() );
+	}
+
 	/**
 	 * Tests various ways of registering, enqueueing, dequeuing, and deregistering a script module.
 	 *
 	 * This ensures that the global function aliases pass all the same parameters as the class methods.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @dataProvider data_test_register_and_enqueue_script_module
 	 *
@@ -163,7 +203,10 @@ public function test_wp_script_modules() {
 	 * @covers WP_Script_Modules::dequeue()
 	 * @covers ::wp_deregister_script_module()
 	 * @covers WP_Script_Modules::deregister()
+	 * @covers WP_Script_Modules::get_queue()
+	 * @covers WP_Script_Modules::get_marked_for_enqueue()
 	 * @covers WP_Script_Modules::set_fetchpriority()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_import_map()
 	 * @covers WP_Script_Modules::print_script_module_preloads()
@@ -180,6 +223,12 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			}
 		};
 
+		$reflection_class       = new ReflectionClass( wp_script_modules() );
+		$get_marked_for_enqueue = $reflection_class->getMethod( 'get_marked_for_enqueue' );
+		if ( PHP_VERSION_ID < 80100 ) {
+			$get_marked_for_enqueue->setAccessible( true );
+		}
+
 		$register_and_enqueue = static function ( ...$args ) use ( $use_global_function, $only_enqueue ) {
 			if ( $use_global_function ) {
 				if ( $only_enqueue ) {
@@ -200,11 +249,17 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 
 		// Minimal args.
 		$register_and_enqueue( 'a', '/a.js' );
+		$this->assertSame( array( 'a' ), wp_script_modules()->get_queue(), 'Expected queue to match.' );
+		$marked_for_enqueue = $get_marked_for_enqueue->invoke( wp_script_modules() );
+		$this->assertSame( wp_script_modules()->get_queue(), array_keys( $marked_for_enqueue ), 'Expected get_queue() to match keys returned by get_marked_for_enqueue().' );
+		$this->assertIsArray( $marked_for_enqueue['a'], 'Expected script module "a" to have an array entry.' );
+		$this->assertSame( '/a.js', $marked_for_enqueue['a']['src'], 'Expected script module "a" to have the given src.' );
 
 		// One Dependency.
 		$register( 'b-dep', '/b-dep.js' );
 		$register_and_enqueue( 'b', '/b.js', array( 'b-dep' ) );
 		$this->assertTrue( wp_script_modules()->set_fetchpriority( 'b', 'low' ) );
+		$this->assertSame( array( 'a', 'b' ), wp_script_modules()->get_queue() );
 
 		// Two dependencies with different formats and a false version.
 		$register( 'c-dep', '/c-static.js', array(), false, array( 'fetchpriority' => 'low' ) );
@@ -221,6 +276,7 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			),
 			false
 		);
+		$this->assertSame( array( 'a', 'b', 'c' ), wp_script_modules()->get_queue() );
 
 		// Two dependencies, one imported statically and the other dynamically, with a null version.
 		$register( 'd-static-dep', '/d-static-dep.js', array(), false, array( 'fetchpriority' => 'auto' ) );
@@ -240,6 +296,7 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			),
 			null
 		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd' ), wp_script_modules()->get_queue() );
 
 		// No dependencies, with a string version version.
 		$register_and_enqueue(
@@ -248,6 +305,7 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			array(),
 			'1.0.0'
 		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e' ), wp_script_modules()->get_queue() );
 
 		// No dependencies, with a string version and fetch priority.
 		$register_and_enqueue(
@@ -257,6 +315,7 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			'2.0.0',
 			array( 'fetchpriority' => 'auto' )
 		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f' ), wp_script_modules()->get_queue() );
 
 		// No dependencies, with a string version and fetch priority of low.
 		$register_and_enqueue(
@@ -266,6 +325,7 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			'2.0.0',
 			array( 'fetchpriority' => 'low' )
 		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f', 'g' ), wp_script_modules()->get_queue() );
 
 		// No dependencies, with a string version and fetch priority of high.
 		$register_and_enqueue(
@@ -275,6 +335,47 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			'3.0.0',
 			array( 'fetchpriority' => 'high' )
 		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' ), wp_script_modules()->get_queue() );
+
+		// Register and enqueue something which we'll dequeue right away.
+		$register_and_enqueue(
+			'i',
+			'/i.js',
+			array(),
+			'3.0.0'
+		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i' ), wp_script_modules()->get_queue() );
+
+		// Register and enqueue something which we'll deregister right away.
+		$register_and_enqueue(
+			'j',
+			'/j.js',
+			array(),
+			'3.0.0'
+		);
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j' ), wp_script_modules()->get_queue() );
+
+		// Make sure unregister functions work.
+		$deregister_id = 'j';
+		$this->assertArrayHasKey( 'j', $this->get_registered_script_modules( $this->script_modules ) );
+		if ( $use_global_function ) {
+			wp_deregister_script_module( $deregister_id );
+		} else {
+			wp_script_modules()->deregister( $deregister_id );
+		}
+		$this->assertArrayNotHasKey( 'j', $this->get_registered_script_modules( $this->script_modules ) );
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i' ), wp_script_modules()->get_queue() );
+
+		// Make sure dequeue functions work.
+		$dequeue_id = 'i';
+		$this->assertArrayHasKey( 'i', $this->get_registered_script_modules( $this->script_modules ) );
+		if ( $use_global_function ) {
+			wp_dequeue_script_module( $dequeue_id );
+		} else {
+			wp_script_modules()->dequeue( $dequeue_id );
+		}
+		$this->assertArrayHasKey( 'i', $this->get_registered_script_modules( $this->script_modules ) );
+		$this->assertSame( array( 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h' ), wp_script_modules()->get_queue() );
 
 		$actual = array(
 			'preload_links' => $this->get_preloaded_script_modules(),
@@ -308,34 +409,42 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 					'a' => array(
 						'url'           => '/a.js?ver=99.9.9',
 						'fetchpriority' => 'auto',
+						'in_footer'     => false,
 					),
 					'b' => array(
 						'url'           => '/b.js?ver=99.9.9',
 						'fetchpriority' => 'low',
+						'in_footer'     => false,
 					),
 					'c' => array(
 						'url'           => '/c.js?ver=99.9.9',
 						'fetchpriority' => 'auto',
+						'in_footer'     => false,
 					),
 					'd' => array(
 						'url'           => '/d.js',
 						'fetchpriority' => 'auto',
+						'in_footer'     => false,
 					),
 					'e' => array(
 						'url'           => '/e.js?ver=1.0.0',
 						'fetchpriority' => 'auto',
+						'in_footer'     => false,
 					),
 					'f' => array(
 						'url'           => '/f.js?ver=2.0.0',
 						'fetchpriority' => 'auto',
+						'in_footer'     => false,
 					),
 					'g' => array(
 						'url'           => '/g.js?ver=2.0.0',
 						'fetchpriority' => 'low',
+						'in_footer'     => false,
 					),
 					'h' => array(
 						'url'           => '/h.js?ver=3.0.0',
 						'fetchpriority' => 'high',
+						'in_footer'     => false,
 					),
 				),
 				'import_map'    => array(
@@ -349,71 +458,6 @@ public function test_comprehensive_methods( bool $use_global_function, bool $onl
 			$actual,
 			"Snapshot:\n" . var_export( $actual, true )
 		);
-
-		// Dequeue the first half of the scripts.
-		foreach ( array( 'a', 'b', 'c', 'd' ) as $id ) {
-			if ( $use_global_function ) {
-				wp_dequeue_script_module( $id );
-			} else {
-				wp_script_modules()->dequeue( $id );
-			}
-		}
-
-		$actual = array(
-			'preload_links' => $this->get_preloaded_script_modules(),
-			'script_tags'   => $this->get_enqueued_script_modules(),
-			'import_map'    => $this->get_import_map(),
-		);
-		$this->assertSame(
-			array(
-				'preload_links' => array(),
-				'script_tags'   => array(
-					'e' => array(
-						'url'           => '/e.js?ver=1.0.0',
-						'fetchpriority' => 'auto',
-					),
-					'f' => array(
-						'url'           => '/f.js?ver=2.0.0',
-						'fetchpriority' => 'auto',
-					),
-					'g' => array(
-						'url'           => '/g.js?ver=2.0.0',
-						'fetchpriority' => 'low',
-					),
-					'h' => array(
-						'url'           => '/h.js?ver=3.0.0',
-						'fetchpriority' => 'high',
-					),
-				),
-				'import_map'    => array(),
-			),
-			$actual,
-			"Snapshot:\n" . var_export( $actual, true )
-		);
-
-		// Unregister the remaining scripts.
-		foreach ( array( 'e', 'f', 'g', 'h' ) as $id ) {
-			if ( $use_global_function ) {
-				wp_dequeue_script_module( $id );
-			} else {
-				wp_script_modules()->dequeue( $id );
-			}
-		}
-
-		$actual = array(
-			'preload_links' => $this->get_preloaded_script_modules(),
-			'script_tags'   => $this->get_enqueued_script_modules(),
-			'import_map'    => $this->get_import_map(),
-		);
-		$this->assertSame(
-			array(
-				'preload_links' => array(),
-				'script_tags'   => array(),
-				'import_map'    => array(),
-			),
-			$actual,
-			"Snapshot:\n" . var_export( $actual, true )
-		);
 	}
 
 	/**
@@ -442,17 +486,30 @@ public function data_test_register_and_enqueue_script_module(): array {
 	 * Tests that a script module gets enqueued correctly after being registered.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::register()
 	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 * @covers WP_Script_Modules::set_fetchpriority()
+	 * @covers WP_Script_Modules::set_in_footer()
 	 */
 	public function test_wp_enqueue_script_module() {
 		$this->script_modules->register( 'foo', '/foo.js' );
-		$this->script_modules->register( 'bar', '/bar.js', array(), false, array( 'fetchpriority' => 'high' ) );
+		$this->script_modules->register(
+			'bar',
+			'/bar.js',
+			array(),
+			false,
+			array(
+				'fetchpriority' => 'high',
+				'in_footer'     => true,
+			)
+		);
 		$this->script_modules->register( 'baz', '/baz.js' );
 		$this->assertTrue( $this->script_modules->set_fetchpriority( 'baz', 'low' ) );
+		$this->assertTrue( $this->script_modules->set_in_footer( 'baz', true ) );
 		$this->script_modules->enqueue( 'foo' );
 		$this->script_modules->enqueue( 'bar' );
 		$this->script_modules->enqueue( 'baz' );
@@ -462,20 +519,66 @@ public function test_wp_enqueue_script_module() {
 		$this->assertCount( 3, $enqueued_script_modules );
 		$this->assertStringStartsWith( '/foo.js', $enqueued_script_modules['foo']['url'] );
 		$this->assertSame( 'auto', $enqueued_script_modules['foo']['fetchpriority'] );
+		$this->assertFalse( $enqueued_script_modules['foo']['in_footer'] );
 		$this->assertStringStartsWith( '/bar.js', $enqueued_script_modules['bar']['url'] );
 		$this->assertSame( 'high', $enqueued_script_modules['bar']['fetchpriority'] );
+		$this->assertTrue( $enqueued_script_modules['bar']['in_footer'] );
 		$this->assertStringStartsWith( '/baz.js', $enqueued_script_modules['baz']['url'] );
 		$this->assertSame( 'low', $enqueued_script_modules['baz']['fetchpriority'] );
+		$this->assertTrue( $enqueued_script_modules['baz']['in_footer'] );
+	}
+
+	/**
+	 * Tests that no script is printed for a script without a src.
+	 *
+	 * @ticket 63486
+	 *
+	 * @covers WP_Script_Modules::register()
+	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
+	 * @covers WP_Script_Modules::print_enqueued_script_modules()
+	 * @covers WP_Script_Modules::get_src()
+	 */
+	public function test_wp_enqueue_script_module_with_empty_src() {
+		wp_enqueue_script_module( 'with-src', '/src.js' );
+		wp_register_script_module( 'without-src', '' );
+		wp_register_script_module( 'without-src-but-filtered', '' );
+		wp_enqueue_script_module( 'without-src' );
+		wp_enqueue_script_module( 'without-src-but-filtered' );
+		$this->assertSame( array( 'with-src', 'without-src', 'without-src-but-filtered' ), wp_script_modules()->get_queue() );
+		add_filter(
+			'script_module_loader_src',
+			static function ( $src, $id ) {
+				if ( 'without-src-but-filtered' === $id ) {
+					$src = '/was-empty-but-added-via-filter.js';
+				}
+				return $src;
+			},
+			10,
+			2
+		);
+		$actual = get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
+		$this->assertEqualHTML(
+			'
+				<script type="module" src="/src.js?ver=6.9-alpha-60093-src" id="with-src-js-module"></script>
+				<script type="module" src="/was-empty-but-added-via-filter.js" id="without-src-but-filtered-js-module"></script>
+			',
+			$actual,
+			'<body>',
+			"Expected only one SCRIPT tag to be printed. Snapshot:\n$actual"
+		);
 	}
 
 	/**
 	* Tests that a script module can be dequeued after being enqueued.
 	*
 	* @ticket 56313
+	* @ticket 63486
 	*
 	* @covers WP_Script_Modules::register()
 	* @covers WP_Script_Modules::enqueue()
 	* @covers WP_Script_Modules::dequeue()
+	* @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	* @covers WP_Script_Modules::print_enqueued_script_modules()
 	*/
 	public function test_wp_dequeue_script_module() {
@@ -570,9 +673,11 @@ public function test_wp_deregister_already_deregistered_script_module() {
 	* be handled correctly once registered.
 	*
 	* @ticket 56313
+	* @ticket 63486
 	*
 	* @covers WP_Script_Modules::register()
 	* @covers WP_Script_Modules::enqueue()
+	* @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	* @covers WP_Script_Modules::print_enqueued_script_modules()
 	*/
 	public function test_wp_enqueue_script_module_works_before_register() {
@@ -593,10 +698,12 @@ public function test_wp_enqueue_script_module_works_before_register() {
 	 * ensures that it is not enqueued after registration.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::register()
 	 * @covers WP_Script_Modules::enqueue()
 	 * @covers WP_Script_Modules::dequeue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 */
 	public function test_wp_dequeue_script_module_works_before_register() {
@@ -960,9 +1067,11 @@ function ( $src, $id ) {
 	 * script modules and preloaded script modules.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::register()
 	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_import_map()
 	 * @covers WP_Script_Modules::print_script_module_preloads()
@@ -998,8 +1107,10 @@ public function test_version_is_propagated_correctly() {
 	 * valid src.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 */
 	public function test_wp_enqueue_script_module_doesnt_register_without_a_valid_src() {
@@ -1016,8 +1127,10 @@ public function test_wp_enqueue_script_module_doesnt_register_without_a_valid_sr
 	 * src.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 */
 	public function test_wp_enqueue_script_module_registers_with_valid_src() {
@@ -1035,8 +1148,10 @@ public function test_wp_enqueue_script_module_registers_with_valid_src() {
 	 * src the second time.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 */
 	public function test_wp_enqueue_script_module_registers_with_valid_src_the_second_time() {
@@ -1061,9 +1176,11 @@ public function test_wp_enqueue_script_module_registers_with_valid_src_the_secon
 	 * enqueue.
 	 *
 	 * @ticket 56313
+	 * @ticket 63486
 	 *
 	 * @covers WP_Script_Modules::register()
 	 * @covers WP_Script_Modules::enqueue()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_enqueued_script_modules()
 	 * @covers WP_Script_Modules::print_import_map()
 	 */
@@ -1314,6 +1431,58 @@ public function test_fetchpriority_values( string $fetchpriority ) {
 		$this->assertSame( 'auto', $registered_modules['test-script-2']['fetchpriority'] );
 	}
 
+	/**
+	 * Tests ways of setting in_footer.
+	 *
+	 * @ticket 63486
+	 * @ticket 63486
+	 *
+	 * @covers ::wp_register_script_module
+	 * @covers ::wp_enqueue_script_module
+	 * @covers WP_Script_Modules::set_in_footer
+	 */
+	public function test_in_footer_methods() {
+		wp_register_script_module( 'default', '/default.js', array(), null );
+		wp_enqueue_script_module( 'default' );
+
+		wp_register_script_module( 'in-footer-via-register', '/in-footer-via-register.js', array(), null, array( 'in_footer' => true ) );
+		wp_enqueue_script_module( 'in-footer-via-register' );
+
+		wp_enqueue_script_module( 'in-footer-via-enqueue', '/in-footer-via-enqueue.js', array(), null, array( 'in_footer' => true ) );
+
+		wp_enqueue_script_module( 'not-in-footer-via-enqueue', '/not-in-footer-via-enqueue.js', array(), null, array( 'in_footer' => false ) );
+
+		wp_enqueue_script_module( 'in-footer-via-override', '/in-footer-via-override.js' );
+		wp_script_modules()->set_in_footer( 'in-footer-via-override', true );
+
+		wp_enqueue_script_module( 'not-in-footer-via-override', '/not-in-footer-via-override.js', array(), null, array( 'in_footer' => true ) );
+		wp_script_modules()->set_in_footer( 'not-in-footer-via-override', false );
+
+		$actual_head   = get_echo( array( wp_script_modules(), 'print_head_enqueued_script_modules' ) );
+		$actual_footer = get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
+
+		$this->assertEqualHTML(
+			$actual_head,
+			'
+				<script type="module" src="/default.js" id="default-js-module"></script>
+				<script type="module" src="/not-in-footer-via-enqueue.js" id="not-in-footer-via-enqueue-js-module"></script>
+				<script type="module" src="/not-in-footer-via-override.js" id="not-in-footer-via-override-js-module"></script>
+			',
+			'<body>',
+			"Expected equal script modules in the HEAD. Snapshot:\n$actual_head"
+		);
+		$this->assertEqualHTML(
+			$actual_footer,
+			'
+				<script type="module" src="/in-footer-via-register.js" id="in-footer-via-register-js-module"></script>
+				<script type="module" src="/in-footer-via-enqueue.js" id="in-footer-via-enqueue-js-module"></script>
+				<script type="module" src="/in-footer-via-override.js?ver=6.9-alpha-60093-src" id="in-footer-via-override-js-module"></script>
+			',
+			'<body>',
+			"Expected equal script modules in the footer. Snapshot:\n$actual_footer"
+		);
+	}
+
 	/**
 	 * Tests that a script module with an invalid fetchpriority value gets a value of auto.
 	 *
@@ -1377,6 +1546,7 @@ public function data_provider_to_test_fetchpriority_bumping(): array {
 						'bajo' => array(
 							'url'                   => '/bajo.js',
 							'fetchpriority'         => 'high',
+							'in_footer'             => false,
 							'data-wp-fetchpriority' => 'low',
 						),
 					),
@@ -1399,6 +1569,7 @@ public function data_provider_to_test_fetchpriority_bumping(): array {
 						'auto' => array(
 							'url'                   => '/auto.js',
 							'fetchpriority'         => 'high',
+							'in_footer'             => false,
 							'data-wp-fetchpriority' => 'auto',
 						),
 					),
@@ -1412,20 +1583,21 @@ public function data_provider_to_test_fetchpriority_bumping(): array {
 				'enqueues' => array( 'alto' ),
 				'expected' => array(
 					'preload_links' => array(
-						'auto' => array(
-							'url'           => '/auto.js',
-							'fetchpriority' => 'high',
-						),
 						'bajo' => array(
 							'url'                   => '/bajo.js',
 							'fetchpriority'         => 'high',
 							'data-wp-fetchpriority' => 'low',
 						),
+						'auto' => array(
+							'url'           => '/auto.js',
+							'fetchpriority' => 'high',
+						),
 					),
 					'script_tags'   => array(
 						'alto' => array(
 							'url'           => '/alto.js',
 							'fetchpriority' => 'high',
+							'in_footer'     => false,
 						),
 					),
 					'import_map'    => array(
@@ -1539,11 +1711,11 @@ public function test_fetchpriority_bumping_a_to_z() {
 		$actual   = get_echo( array( wp_script_modules(), 'print_script_module_preloads' ) );
 		$actual  .= get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
 		$expected = '
-			<link rel="modulepreload" href="/b.js" id="b-js-modulepreload" fetchpriority="low">
-			<link rel="modulepreload" href="/c.js" id="c-js-modulepreload" fetchpriority="low">
+			<link rel="modulepreload" href="/z.js" id="z-js-modulepreload" fetchpriority="high">
 			<link rel="modulepreload" href="/d.js" id="d-js-modulepreload" fetchpriority="high">
 			<link rel="modulepreload" href="/e.js" id="e-js-modulepreload" fetchpriority="low">
-			<link rel="modulepreload" href="/z.js" id="z-js-modulepreload" fetchpriority="high">
+			<link rel="modulepreload" href="/c.js" id="c-js-modulepreload" fetchpriority="low">
+			<link rel="modulepreload" href="/b.js" id="b-js-modulepreload" fetchpriority="low">
 			<link rel="modulepreload" href="/y.js" id="y-js-modulepreload" fetchpriority="high">
 			<script type="module" src="/a.js" id="a-js-module" fetchpriority="low"></script>
 			<script type="module" src="/x.js" id="x-js-module" fetchpriority="high"></script>
@@ -1584,12 +1756,12 @@ public function test_fetchpriority_propagation() {
 		$actual   = get_echo( array( wp_script_modules(), 'print_script_module_preloads' ) );
 		$actual  .= get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
 		$expected = '
-			<link rel="modulepreload" href="/a.js" id="a-js-modulepreload" fetchpriority="low" data-wp-fetchpriority="high">
 			<link rel="modulepreload" href="/d.js" id="d-js-modulepreload" fetchpriority="low">
 			<link rel="modulepreload" href="/e.js" id="e-js-modulepreload" fetchpriority="high" data-wp-fetchpriority="low">
+			<link rel="modulepreload" href="/a.js" id="a-js-modulepreload" fetchpriority="low" data-wp-fetchpriority="high">
 			<link rel="modulepreload" href="/b.js" id="b-js-modulepreload">
-			<link rel="modulepreload" href="/c.js" id="c-js-modulepreload" fetchpriority="high">
 			<link rel="modulepreload" href="/f.js" id="f-js-modulepreload" fetchpriority="high">
+			<link rel="modulepreload" href="/c.js" id="c-js-modulepreload" fetchpriority="high">
 			<script type="module" src="/x.js" id="x-js-module" fetchpriority="low"></script>
 			<script type="module" src="/y.js" id="y-js-module"></script>
 			<script type="module" src="/z.js" id="z-js-module" fetchpriority="high"></script>
@@ -1600,8 +1772,11 @@ public function test_fetchpriority_propagation() {
 	/**
 	 * Tests that default script modules are printed as expected.
 	 *
+	 * @ticket 63486
+	 *
 	 * @covers ::wp_default_script_modules
 	 * @covers WP_Script_Modules::print_script_module_preloads
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules
 	 * @covers WP_Script_Modules::print_enqueued_script_modules
 	 */
 	public function test_default_script_modules() {
@@ -1609,17 +1784,34 @@ public function test_default_script_modules() {
 		wp_enqueue_script_module( '@wordpress/a11y' );
 		wp_enqueue_script_module( '@wordpress/block-library/navigation/view' );
 
-		$actual  = get_echo( array( wp_script_modules(), 'print_script_module_preloads' ) );
-		$actual .= get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
+		$actual_preloads = $this->normalize_markup_for_snapshot( get_echo( array( wp_script_modules(), 'print_script_module_preloads' ) ) );
+		$this->assertEqualHTML(
+			'
+				<link rel="modulepreload" href="/wp-includes/js/dist/script-modules/interactivity/debug.min.js" id="@wordpress/interactivity-js-modulepreload" fetchpriority="low">
+			',
+			$actual_preloads,
+			'<body>',
+			"Snapshot:\n$actual_preloads"
+		);
 
-		$actual = $this->normalize_markup_for_snapshot( $actual );
+		$actual_head_script_modules = $this->normalize_markup_for_snapshot( get_echo( array( wp_script_modules(), 'print_head_enqueued_script_modules' ) ) );
+		$this->assertEqualHTML(
+			'',
+			$actual_head_script_modules,
+			'<body>',
+			"Snapshot:\n$actual_head_script_modules"
+		);
 
-		$expected = '
-			<link rel="modulepreload" href="/wp-includes/js/dist/script-modules/interactivity/debug.min.js" id="@wordpress/interactivity-js-modulepreload" fetchpriority="low">
-			<script type="module" src="/wp-includes/js/dist/script-modules/a11y/index.min.js" id="@wordpress/a11y-js-module" fetchpriority="low"></script>
-			<script type="module" src="/wp-includes/js/dist/script-modules/block-library/navigation/view.min.js" id="@wordpress/block-library/navigation/view-js-module" fetchpriority="low"></script>
-		';
-		$this->assertEqualHTML( $expected, $actual, '<body>', "Snapshot:\n$actual" );
+		$actual_footer_script_modules = $this->normalize_markup_for_snapshot( get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) ) );
+		$this->assertEqualHTML(
+			'
+				<script type="module" src="/wp-includes/js/dist/script-modules/a11y/index.min.js" id="@wordpress/a11y-js-module" fetchpriority="low"></script>
+				<script type="module" src="/wp-includes/js/dist/script-modules/block-library/navigation/view.min.js" id="@wordpress/block-library/navigation/view-js-module" fetchpriority="low"></script>
+			',
+			$actual_footer_script_modules,
+			'<body>',
+			"Snapshot:\n$actual_footer_script_modules"
+		);
 	}
 
 	/**
@@ -1646,8 +1838,8 @@ public function test_dependent_of_default_script_modules() {
 
 		$expected = '
 			<link rel="modulepreload" href="/wp-includes/js/dist/script-modules/a11y/index.min.js" id="@wordpress/a11y-js-modulepreload" fetchpriority="high" data-wp-fetchpriority="low">
-			<link rel="modulepreload" href="/wp-includes/js/dist/script-modules/block-library/navigation/view.min.js" id="@wordpress/block-library/navigation/view-js-modulepreload" fetchpriority="high" data-wp-fetchpriority="low">
 			<link rel="modulepreload" href="/wp-includes/js/dist/script-modules/interactivity/debug.min.js" id="@wordpress/interactivity-js-modulepreload" fetchpriority="high" data-wp-fetchpriority="low">
+			<link rel="modulepreload" href="/wp-includes/js/dist/script-modules/block-library/navigation/view.min.js" id="@wordpress/block-library/navigation/view-js-modulepreload" fetchpriority="high" data-wp-fetchpriority="low">
 			<script type="module" src="/super-important-module.js" id="super-important-js-module" fetchpriority="high"></script>
 		';
 		$this->assertEqualHTML( $expected, $actual, '<body>', "Snapshot:\n$actual" );
@@ -1730,4 +1922,379 @@ public static function data_invalid_script_module_data(): array {
 			'string'   => array( 'string' ),
 		);
 	}
+
+	/**
+	 * Tests various ways of printing and dependency ordering of script modules.
+	 *
+	 * This ensures that the global function aliases pass all the same parameters as the class methods.
+	 *
+	 * @ticket 63486
+	 *
+	 * @dataProvider data_test_register_and_enqueue_script_module
+	 *
+	 * @covers ::wp_register_script_module()
+	 * @covers WP_Script_Modules::register()
+	 * @covers ::wp_enqueue_script_module()
+	 * @covers WP_Script_Modules::enqueue()
+	 * @covers ::wp_dequeue_script_module()
+	 * @covers WP_Script_Modules::dequeue()
+	 * @covers ::wp_deregister_script_module()
+	 * @covers WP_Script_Modules::deregister()
+	 * @covers WP_Script_Modules::set_fetchpriority()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
+	 * @covers WP_Script_Modules::print_enqueued_script_modules()
+	 * @covers WP_Script_Modules::print_import_map()
+	 * @covers WP_Script_Modules::print_script_module_preloads()
+	 */
+	public function test_script_module_printing_and_dependency_ordering( bool $use_global_function, bool $only_enqueue ) {
+		global $wp_version;
+		$wp_version = '99.9.9';
+
+		$register = static function ( ...$args ) use ( $use_global_function ) {
+			if ( $use_global_function ) {
+				wp_register_script_module( ...$args );
+			} else {
+				wp_script_modules()->register( ...$args );
+			}
+		};
+
+		$register_and_enqueue = static function ( ...$args ) use ( $use_global_function, $only_enqueue ) {
+			if ( $use_global_function ) {
+				if ( $only_enqueue ) {
+					wp_enqueue_script_module( ...$args );
+				} else {
+					wp_register_script_module( ...$args );
+					wp_enqueue_script_module( $args[0] );
+				}
+			} else {
+				if ( $only_enqueue ) {
+					wp_script_modules()->enqueue( ...$args );
+				} else {
+					wp_script_modules()->register( ...$args );
+					wp_script_modules()->enqueue( $args[0] );
+				}
+			}
+		};
+
+		$deregister = static function ( array $ids ) use ( $use_global_function ) {
+			foreach ( $ids as $id ) {
+				if ( $use_global_function ) {
+					wp_deregister_script_module( $id );
+				} else {
+					wp_script_modules()->deregister( $id );
+				}
+			}
+		};
+
+		// Test script module is placed in footer when in_footer is true.
+		$register_and_enqueue( 'a', '/a.js', array(), '1.0.0', array( 'in_footer' => true ) );
+
+		$actual = array(
+			'preload_links' => $this->get_preloaded_script_modules(),
+			'script_tags'   => $this->get_enqueued_script_modules(),
+			'import_map'    => $this->get_import_map(),
+		);
+		$this->assertSame(
+			array(
+				'preload_links' => array(),
+				'script_tags'   => array(
+					'a' => array(
+						'url'           => '/a.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+				),
+				'import_map'    => array(),
+			),
+			$actual,
+			"Snapshot:\n" . var_export( $actual, true )
+		);
+
+		$deregister( array( 'a' ) );
+
+		// Test that dependant also gets placed in footer when its dependency is in footer.
+		$register_and_enqueue( 'b', '/b.js', array(), '1.0.0', array( 'in_footer' => true ) );
+		$register_and_enqueue( 'c', '/c.js', array( 'b' ), '1.0.0' );
+
+		$actual = array(
+			'preload_links' => $this->get_preloaded_script_modules(),
+			'script_tags'   => $this->get_enqueued_script_modules(),
+			'import_map'    => $this->get_import_map(),
+		);
+		$this->assertSame(
+			array(
+				'preload_links' => array(),
+				'script_tags'   => array(
+					'b' => array(
+						'url'           => '/b.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+					'c' => array(
+						'url'           => '/c.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+				),
+				'import_map'    => array(
+					'b' => '/b.js?ver=1.0.0',
+				),
+			),
+			$actual,
+			"Snapshot:\n" . var_export( $actual, true )
+		);
+
+		$deregister( array( 'b', 'c ' ) );
+
+		// Test that registered dependency in footer doesn't place dependant in footer.
+		$register( 'd', '/d.js', array(), '1.0.0', array( 'in_footer' => true ) );
+		$register_and_enqueue( 'e', '/e.js', array( 'd' ), '1.0.0' );
+
+		$actual = array(
+			'preload_links' => $this->get_preloaded_script_modules(),
+			'script_tags'   => $this->get_enqueued_script_modules(),
+			'import_map'    => $this->get_import_map(),
+		);
+		$this->assertSame(
+			array(
+				'preload_links' => array(
+					'd' => array(
+						'url'           => '/d.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+					),
+				),
+				'script_tags'   => array(
+					'e' => array(
+						'url'           => '/e.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+				),
+				'import_map'    => array(
+					'd' => '/d.js?ver=1.0.0',
+				),
+			),
+			$actual,
+			"Snapshot:\n" . var_export( $actual, true )
+		);
+
+		$deregister( array( 'd', 'e' ) );
+
+		// Test if one of the dependency is in footer, the dependant and other dependant dependencies are also placed in footer.
+		$register_and_enqueue( 'f', '/f.js', array(), '1.0.0' );
+		$register_and_enqueue( 'g', '/g.js', array( 'f' ), '1.0.0', array( 'in_footer' => true ) );
+		$register_and_enqueue( 'h', '/h.js', array( 'g' ), '1.0.0' );
+		$register_and_enqueue( 'i', '/i.js', array( 'h' ), '1.0.0' );
+
+		$actual = array(
+			'preload_links' => $this->get_preloaded_script_modules(),
+			'script_tags'   => $this->get_enqueued_script_modules(),
+			'import_map'    => $this->get_import_map(),
+		);
+
+		$this->assertSame(
+			array(
+				'preload_links' => array(),
+				'script_tags'   => array(
+					'f' => array(
+						'url'           => '/f.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+					'g' => array(
+						'url'           => '/g.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+					'h' => array(
+						'url'           => '/h.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+					'i' => array(
+						'url'           => '/i.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+				),
+				'import_map'    => array(
+					'f' => '/f.js?ver=1.0.0',
+					'g' => '/g.js?ver=1.0.0',
+					'h' => '/h.js?ver=1.0.0',
+				),
+			),
+			$actual,
+			"Snapshot:\n" . var_export( $actual, true )
+		);
+
+		$deregister( array( 'f', 'g', 'h', 'i' ) );
+
+		// Test dependency ordering when all scripts modules are enqueued in head.
+		// Expected order: j, k, l, m.
+		$register_and_enqueue( 'm', '/m.js', array( 'j', 'l' ), '1.0.0' );
+		$register_and_enqueue( 'k', '/k.js', array( 'j' ), '1.0.0' );
+		$register_and_enqueue( 'l', '/l.js', array( 'k' ), '1.0.0' );
+		$register_and_enqueue( 'j', '/j.js', array(), '1.0.0' );
+
+		$actual = array(
+			'preload_links' => $this->get_preloaded_script_modules(),
+			'script_tags'   => $this->get_enqueued_script_modules(),
+			'import_map'    => $this->get_import_map(),
+		);
+
+		$this->assertSame(
+			array(
+				'preload_links' => array(),
+				'script_tags'   => array(
+					'j' => array(
+						'url'           => '/j.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+					'k' => array(
+						'url'           => '/k.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+					'l' => array(
+						'url'           => '/l.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+					'm' => array(
+						'url'           => '/m.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+				),
+				'import_map'    => array(
+					'j' => '/j.js?ver=1.0.0',
+					'l' => '/l.js?ver=1.0.0',
+					'k' => '/k.js?ver=1.0.0',
+				),
+			),
+			$actual,
+			"Snapshot:\n" . var_export( $actual, true )
+		);
+
+		$deregister( array( 'j', 'k', 'l', 'm' ) );
+
+		// Test dependency ordering when scripts modules are enqueued in both head and footer.
+		// Expected order: q, n, o, p, r.
+		$register_and_enqueue( 'n', '/n.js', array( 'q' ), '1.0.0' );
+		$register_and_enqueue( 'q', '/q.js', array(), '1.0.0' );
+		$register_and_enqueue( 'o', '/o.js', array( 'n' ), '1.0.0', array( 'in_footer' => true ) );
+		$register_and_enqueue( 'r', '/r.js', array( 'q', 'o', 'p' ), '1.0.0' );
+		$register_and_enqueue( 'p', '/p.js', array(), '1.0.0', array( 'in_footer' => true ) );
+
+		$actual = array(
+			'preload_links' => $this->get_preloaded_script_modules(),
+			'script_tags'   => $this->get_enqueued_script_modules(),
+			'import_map'    => $this->get_import_map(),
+		);
+
+		$this->assertSame(
+			array(
+				'preload_links' => array(),
+				'script_tags'   => array(
+					'q' => array(
+						'url'           => '/q.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+					'n' => array(
+						'url'           => '/n.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => false,
+					),
+					'o' => array(
+						'url'           => '/o.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+					'p' => array(
+						'url'           => '/p.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+					'r' => array(
+						'url'           => '/r.js?ver=1.0.0',
+						'fetchpriority' => 'auto',
+						'in_footer'     => true,
+					),
+				),
+				'import_map'    => array(
+					'q' => '/q.js?ver=1.0.0',
+					'n' => '/n.js?ver=1.0.0',
+					'o' => '/o.js?ver=1.0.0',
+					'p' => '/p.js?ver=1.0.0',
+				),
+			),
+			$actual,
+			"Snapshot:\n" . var_export( $actual, true )
+		);
+	}
+
+	/**
+	 * Tests various ways of printing and dependency ordering of script modules.
+	 *
+	 * @ticket 63486
+	 *
+	 * @dataProvider data_test_register_and_enqueue_script_module
+	 *
+	 * @covers ::wp_register_script_module()
+	 * @covers WP_Script_Modules::register()
+	 * @covers ::wp_enqueue_script_module()
+	 * @covers WP_Script_Modules::enqueue()
+	 * @covers ::wp_dequeue_script_module()
+	 * @covers WP_Script_Modules::dequeue()
+	 * @covers ::wp_deregister_script_module()
+	 * @covers WP_Script_Modules::deregister()
+	 * @covers WP_Script_Modules::set_fetchpriority()
+	 * @covers WP_Script_Modules::print_head_enqueued_script_modules()
+	 * @covers WP_Script_Modules::print_enqueued_script_modules()
+	 * @covers WP_Script_Modules::print_import_map()
+	 * @covers WP_Script_Modules::print_script_module_preloads()
+	 */
+	public function test_static_import_dependency_with_dynamic_imports_depending_on_static_import_dependency() {
+		$get_dependency = function ( string $id, string $import ): array {
+			return compact( 'id', 'import' );
+		};
+
+		wp_register_script_module( 'enqueued', '/enqueued.js', array( $get_dependency( 'static1', 'static' ) ), null );
+		wp_register_script_module( 'static1', '/static1.js', array( $get_dependency( 'dynamic1', 'dynamic' ) ), null );
+		wp_register_script_module( 'dynamic1', '/dynamic1.js', array( $get_dependency( 'static2', 'static' ) ), null );
+		wp_register_script_module( 'static2', '/static2.js', array(), null );
+
+		wp_enqueue_script_module( 'enqueued' );
+		$import_map     = $this->get_import_map();
+		$preload_links  = get_echo( array( wp_script_modules(), 'print_script_module_preloads' ) );
+		$script_modules = get_echo( array( wp_script_modules(), 'print_enqueued_script_modules' ) );
+
+		$this->assertEquals(
+			array(
+				'static1'  => '/static1.js',
+				'dynamic1' => '/dynamic1.js',
+				'static2'  => '/static2.js',
+			),
+			$import_map,
+			"Expected import map to match snapshot:\n" . var_export( $import_map, true )
+		);
+		$this->assertEqualHTML(
+			'
+				<link rel="modulepreload" href="/static1.js" id="static1-js-modulepreload">
+			',
+			$preload_links,
+			'<body>',
+			"Expected preload links to match snapshot:\n$preload_links"
+		);
+		$this->assertEqualHTML(
+			'
+				<script type="module" src="/enqueued.js" id="enqueued-js-module"></script>
+			',
+			$script_modules,
+			'<body>',
+			"Expected script modules to match snapshot:\n$script_modules"
+		);
+	}
 }