WP_Theme_JSON::compute_preset_classes() WordPress Method

	protected static function compute_preset_classes( $settings, $selector, $origins ) {
		if ( static::ROOT_BLOCK_SELECTOR === $selector ) {
			// Classes at the global level do not need any CSS prefixed,
			// and we don't want to increase its specificity.
			$selector = '';
		}

		$stylesheet = '';
		foreach ( static::PRESETS_METADATA as $preset_metadata ) {
			$slugs = static::get_settings_slugs( $settings, $preset_metadata, $origins );
			foreach ( $preset_metadata['classes'] as $class => $property ) {
				foreach ( $slugs as $slug ) {
					$css_var     = static::replace_slug_in_string( $preset_metadata['css_vars'], $slug );
					$class_name  = static::replace_slug_in_string( $class, $slug );
					$stylesheet .= static::to_ruleset(
						static::append_to_selector( $selector, $class_name ),
						array(
							array(
								'name'  => $property,
								'value' => 'var(' . $css_var . ') !important',
							),
						)
					);
				}
			}
		}

		return $stylesheet;
	}