ck-before::before {
      content: " before "; /* [sic] leading and trailing space */
      content: " before " / " alt-before "; /* Override the previous line for engines that support the Alternative Text syntax. */
    }
    .fallback-after::after {
      content: " after "; /* [sic] leading and trailing space */
      content: " after " / " alt-after "; /* Override the previous line for engines that support the Alternative Text syntax. */
    }
    .fallback-before-empty::before {
      content: "before"