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function get_block_core_post_featured_image_overlay_element_markup( $attributes ) {
	$has_dim_background  = isset( $attributes['dimRatio'] ) && $attributes['dimRatio'];
	$has_gradient        = isset( $attributes['gradient'] ) && $attributes['gradient'];
	$has_custom_gradient = isset( $attributes['customGradient'] ) && $attributes['customGradient'];
	$has_solid_overlay   = isset( $attributes['overlayColor'] ) && $attributes['overlayColor'];
	$has_custom_overlay  = isset( $attributes['customOverlayColor'] ) && $attributes['customOverlayColor'];
	$class_names         = array( 'wp-block-post-featured-image__overlay' );
	$styles              = array();

	if ( ! $has_dim_background ) {
		return '';
	}

	// Apply border classes and styles.
	$border_attributes = get_block_core_post_featured_image_border_attributes( $attributes );

	if ( ! empty( $border_attributes['class'] ) ) {
		$class_names[] = $border_attributes['class'];
	}

	if ( ! empty( $border_attributes['style'] ) ) {
		$styles[] = $border_attributes['style'];
	}

	// Apply overlay and gradient classes.
	if ( $has_dim_background ) {
		$class_names[] = 'has-background-dim';
		$class_names[] = "has-background-dim-{$attributes['dimRatio']}";
	}

	if ( $has_solid_overlay ) {
		$class_names[] = "has-{$attributes['overlayColor']}-background-color";
	}

	if ( $has_gradient || $has_custom_gradient ) {
		$class_names[] = 'has-background-gradient';
	}

	if ( $has_gradient ) {
		$class_names[] = "has-{$attributes['gradient']}-gradient-background";
	}

	// Apply background styles.
	if ( $has_custom_gradient ) {
		$styles[] = sprintf( 'background-image: %s;', $attributes['customGradient'] );
	}

	if ( $has_custom_overlay ) {
		$styles[] = sprintf( 'background-color: %s;', $attributes['customOverlayColor'] );
	}

	return sprintf(
		'<span class="%s" style="%s" aria-hidden="true"></span>',
		esc_attr( implode( ' ', $class_names ) ),
		esc_attr( safecss_filter_attr( implode( ' ', $styles ) ) )
	);
}