  / "";
    }
    .fallback-before-image-empty::before {
      content: "before " url(/images/blue.png) / "";
    }
    .fallback-before-mixed::before {
      content: " before "; /* [sic] leading and trailing space */
      content: " before " / " start " attr(data-alt-text-before) " end "; /* Override the previous line for engines that support the Alternative Text syntax. */
    }
    .fallback-after-mixed::after {
      content: " after "; /* [sic] leading and trailing space */
      content: " after " /