diff --git a/src/wp-includes/block-supports/border.php b/src/wp-includes/block-supports/border.php
index 9c466c009d581..a0e2c8adaac58 100644
--- a/src/wp-includes/block-supports/border.php
+++ b/src/wp-includes/block-supports/border.php
@@ -142,6 +142,27 @@ function wp_apply_border_support( $block_type, $block_attributes ) {
 	return $attributes;
 }
 
+/**
+ * Checks whether serialization of the current block's border properties should
+ * occur.
+ *
+ * @since 5.8.0
+ * @access private
+ * @deprecated 6.0.0
+ *
+ * @param WP_Block_Type $block_type Block type.
+ * @return bool Whether serialization of the current block's border properties
+ *              should occur.
+ */
+function wp_skip_border_serialization( $block_type ) {
+	_deprecated_function( __FUNCTION__, '6.0.0' );
+	$border_support = _wp_array_get( $block_type->supports, array( '__experimentalBorder' ), false );
+
+	return is_array( $border_support ) &&
+		array_key_exists( '__experimentalSkipSerialization', $border_support ) &&
+		$border_support['__experimentalSkipSerialization'];
+}
+
 /**
  * Checks whether the current block type supports the border feature requested.
  *
diff --git a/src/wp-includes/block-supports/dimensions.php b/src/wp-includes/block-supports/dimensions.php
index 3223dbe0af4ac..18c0486ef339d 100644
--- a/src/wp-includes/block-supports/dimensions.php
+++ b/src/wp-includes/block-supports/dimensions.php
@@ -63,6 +63,25 @@ function wp_apply_dimensions_support( $block_type, $block_attributes ) { // phpc
 	return empty( $styles ) ? array() : array( 'style' => implode( ' ', $styles ) );
 }
 
+/**
+ * Checks whether serialization of the current block's dimensions properties
+ * should occur.
+ *
+ * @since 5.9.0
+ * @access private
+ * @deprecated 6.0.0
+ *
+ * @param WP_Block_type $block_type Block type.
+ * @return bool Whether to serialize spacing support styles & classes.
+ */
+function wp_skip_dimensions_serialization( $block_type ) {
+	_deprecated_function( __FUNCTION__, '6.0.0' );
+	$dimensions_support = _wp_array_get( $block_type->supports, array( '__experimentalDimensions' ), false );
+	return is_array( $dimensions_support ) &&
+		array_key_exists( '__experimentalSkipSerialization', $dimensions_support ) &&
+		$dimensions_support['__experimentalSkipSerialization'];
+}
+
 // Register the block support.
 WP_Block_Supports::get_instance()->register(
 	'dimensions',
diff --git a/src/wp-includes/block-supports/spacing.php b/src/wp-includes/block-supports/spacing.php
index f91194469a0a1..c56bb9e28d778 100644
--- a/src/wp-includes/block-supports/spacing.php
+++ b/src/wp-includes/block-supports/spacing.php
@@ -79,6 +79,26 @@ function wp_apply_spacing_support( $block_type, $block_attributes ) {
 	return empty( $styles ) ? array() : array( 'style' => implode( ' ', $styles ) );
 }
 
+/**
+ * Checks whether serialization of the current block's spacing properties should
+ * occur.
+ *
+ * @since 5.9.0
+ * @access private
+ * @deprecated 6.0.0
+ *
+ * @param WP_Block_Type $block_type Block type.
+ * @return bool Whether to serialize spacing support styles & classes.
+ */
+function wp_skip_spacing_serialization( $block_type ) {
+	_deprecated_function( __FUNCTION__, '6.0.0' );
+	$spacing_support = _wp_array_get( $block_type->supports, array( 'spacing' ), false );
+
+	return is_array( $spacing_support ) &&
+		array_key_exists( '__experimentalSkipSerialization', $spacing_support ) &&
+		$spacing_support['__experimentalSkipSerialization'];
+}
+
 // Register the block support.
 WP_Block_Supports::get_instance()->register(
 	'spacing',