stylelint-config-drupal/test/format-rulesets.css

Drupal stylelint configuration

/**
 * @file
 * Format rule sets test.
 *
 * @see https://www.drupal.org/docs/develop/standards/css/css-formatting-guidelines#s-rulesets
 */

/**
 * - Use one selector per line when a ruleset has a group of selectors separated
 *   by commas.
 * - The opening brace ({) of a ruleset’s declaration block should be on the
 *   same line as the selector (or the same line as the last selector in a group
 *   of selectors.) The opening brace should include a single space before it.
 * - Place the closing brace (}) of a ruleset in the same column as the first
 *   character in the selector of the ruleset.
 * - Each declaration should be indented one level relative to its selector.
 */
.selector-alpha,
.selector-beta {
  counter-reset: section;
  text-transform: small-caps;
}