Ticket #58915: 58915.patch

src/wp-content/themes/twentysixteen/css/blocks.css

@@ -319 +319 @@
         margin-bottom: 0;
 }
 
+/* Details */
+
+.wp-block-details > summary:first-of-type {
+        display: list-item;
+}
+
 /*--------------------------------------------------------------
 5.0 Blocks - Widget Blocks
 --------------------------------------------------------------*/

src/wp-content/themes/twentythirteen/css/blocks.css

@@ -544 +544 @@
         margin-bottom: 0;
 }
 
+/* Details */
+
+.wp-block-details > summary:first-of-type {
+        display: list-item;
+}
+
 /*--------------------------------------------------------------
 6.0 Blocks - Widgets
 --------------------------------------------------------------*/