Ticket #64525: 64525.diff

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

@@ -81 +81 @@
 main,
 menu,
 nav,
-section,
-summary {
+section {
         display: block;
 }
 

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

@@ -74 +74 @@
 footer,
 header,
 nav,
-section,
-summary {
+section {
         display: block;
 }