diff --git a/src/wp-includes/theme.php b/src/wp-includes/theme.php
index 44343569a61b1..5f5d58a69e0af 100644
--- a/src/wp-includes/theme.php
+++ b/src/wp-includes/theme.php
@@ -2645,6 +2645,7 @@ function get_theme_starter_content() {
  * @since 6.5.0 The `appearance-tools` feature enables a few design tools for blocks,
  *              see `WP_Theme_JSON::APPEARANCE_TOOLS_OPT_INS` for a complete list.
  * @since 6.6.0 The `editor-spacing-sizes` feature was added.
+ * @since 7.0.0 Deprecated the `html5` feature 'script'.
  *
  * @global array $_wp_theme_features
  *
@@ -3146,8 +3147,7 @@ function _remove_theme_support( $feature ) {
  * @since 2.9.0
  * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
  *              by adding it to the function signature.
- *
- * @global array $_wp_theme_features
+ * @since 7.0.0 HTML5 script support will always report `true`.
  *
  * @param string $feature The feature being checked. See add_theme_support() for the list
  *                        of possible values.
@@ -3155,20 +3155,20 @@ function _remove_theme_support( $feature ) {
  * @return bool True if the active theme supports the feature, false otherwise.
  */
 function current_theme_supports( $feature, ...$args ) {
-	global $_wp_theme_features;
-
 	if ( 'custom-header-uploads' === $feature ) {
 		return current_theme_supports( 'custom-header', 'uploads' );
 	}
 
-	if ( ! isset( $_wp_theme_features[ $feature ] ) ) {
+	$feature_support = get_theme_support( $feature, ...$args );
+
+	if ( ! $feature_support ) {
 		return false;
 	}
 
 	// If no args passed then no extra checks need to be performed.
 	if ( ! $args ) {
 		/** This filter is documented in wp-includes/theme.php */
-		return apply_filters( "current_theme_supports-{$feature}", true, $args, $_wp_theme_features[ $feature ] ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		return apply_filters( "current_theme_supports-{$feature}", true, $args, $feature_support ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 	}
 
 	switch ( $feature ) {
@@ -3178,11 +3178,11 @@ function current_theme_supports( $feature, ...$args ) {
 			 * by passing an array of types to add_theme_support().
 			 * If no array was passed, then any type is accepted.
 			 */
-			if ( true === $_wp_theme_features[ $feature ] ) {  // Registered for all types.
+			if ( true === $feature_support ) {  // Registered for all types.
 				return true;
 			}
 			$content_type = $args[0];
-			return in_array( $content_type, $_wp_theme_features[ $feature ][0], true );
+			return in_array( $content_type, $feature_support[0], true );
 
 		case 'html5':
 		case 'post-formats':
@@ -3193,13 +3193,19 @@ function current_theme_supports( $feature, ...$args ) {
 			 * Specific areas of HTML5 support *must* be passed via an array to add_theme_support().
 			 */
 			$type = $args[0];
-			return in_array( $type, $_wp_theme_features[ $feature ][0], true );
+
+			// Non-HTML5 script support is deprecated. HTML5 script support is always enabled.
+			if ( 'html5' === $feature && 'script' === $type ) {
+				return true;
+			}
+
+			return in_array( $type, $feature_support[0], true );
 
 		case 'custom-logo':
 		case 'custom-header':
 		case 'custom-background':
 			// Specific capabilities can be registered by passing an array to add_theme_support().
-			return ( isset( $_wp_theme_features[ $feature ][0][ $args[0] ] ) && $_wp_theme_features[ $feature ][0][ $args[0] ] );
+			return ( isset( $feature_support[0][ $args[0] ] ) && $feature_support[0][ $args[0] ] );
 	}
 
 	/**
@@ -3214,7 +3220,7 @@ function current_theme_supports( $feature, ...$args ) {
 	 * @param array  $args     Array of arguments for the feature.
 	 * @param string $feature  The theme feature.
 	 */
-	return apply_filters( "current_theme_supports-{$feature}", true, $args, $_wp_theme_features[ $feature ] ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+	return apply_filters( "current_theme_supports-{$feature}", true, $args, $feature_support ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 }
 
 /**
@@ -4395,7 +4401,7 @@ function _add_default_theme_supports() {
 	 * (which use default template functions) and `[caption]` and `[gallery]` shortcodes.
 	 * Other blocks contain their own HTML5 markup.
 	 */
-	add_theme_support( 'html5', array( 'comment-form', 'comment-list', 'search-form', 'gallery', 'caption', 'style', 'script' ) );
+	add_theme_support( 'html5', array( 'comment-form', 'comment-list', 'search-form', 'gallery', 'caption', 'style' ) );
 	add_theme_support( 'automatic-feed-links' );
 
 	add_filter( 'should_load_separate_core_block_assets', '__return_true' );
diff --git a/tests/phpunit/tests/rest-api/rest-themes-controller.php b/tests/phpunit/tests/rest-api/rest-themes-controller.php
index 923e7cda27374..4d7d221799ead 100644
--- a/tests/phpunit/tests/rest-api/rest-themes-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-themes-controller.php
@@ -429,7 +429,13 @@ public function test_get_item_schema() {
 		$this->assertArrayHasKey( 'editor-spacing-sizes', $theme_supports );
 		$this->assertArrayHasKey( 'editor-styles', $theme_supports );
 		$this->assertArrayHasKey( 'formats', $theme_supports );
+
 		$this->assertArrayHasKey( 'html5', $theme_supports );
+		$this->assertSame(
+			array( 'search-form', 'comment-form', 'comment-list', 'gallery', 'caption', 'style', 'script' ),
+			$theme_supports['html5']
+		);
+
 		$this->assertArrayHasKey( 'post-thumbnails', $theme_supports );
 		$this->assertArrayHasKey( 'responsive-embeds', $theme_supports );
 		$this->assertArrayHasKey( 'title-tag', $theme_supports );
diff --git a/tests/phpunit/tests/theme/support.php b/tests/phpunit/tests/theme/support.php
index aed9d94d3c1fd..7625422d7d70f 100644
--- a/tests/phpunit/tests/theme/support.php
+++ b/tests/phpunit/tests/theme/support.php
@@ -141,6 +141,20 @@ public function test_supports_html5_invalid() {
 		$this->assertFalse( current_theme_supports( 'html5' ) );
 	}
 
+	/**
+	 * Tests that `current_theme_supports( 'html5', 'script' )` always returns true.
+	 *
+	 * Non-HTML5 script output was removed in WordPress 7.0, so script support
+	 * is now always enabled regardless of theme configuration.
+	 *
+	 * @ticket 64442
+	 */
+	public function test_html5_script_support_always_true() {
+		// Should be true even without any theme support registered.
+		remove_theme_support( 'html5' );
+		$this->assertTrue( current_theme_supports( 'html5', 'script' ) );
+	}
+
 	/**
 	 * @ticket 51390
 	 *