--- /dev/null
+/**
+ * @file
+ * Fixes for core/assets/vendor/normalize-css/normalize.css since version 3.
+ */
+
+/**
+ * Fix problem with details/summary lines missing the drop arrows.
+ */
+@media (min--moz-device-pixel-ratio: 0) {
+ summary {
+ display: list-item;
+ }
+}