diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 89dbc4d825f3d..b86f012c0e168 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -1732,7 +1732,8 @@ details.undocumented[open] > summary::before {
 		width: calc(100% + 30px);
 	}
 
-	.show-it {
+	.show-it, .sidebar-elems:focus-within {
+		z-index:  2;
 		left: 0;
 	}
 
diff --git a/src/test/rustdoc-gui/sidebar-mobile.goml b/src/test/rustdoc-gui/sidebar-mobile.goml
index 9a1442e48a9ea..f0c9361d0806b 100644
--- a/src/test/rustdoc-gui/sidebar-mobile.goml
+++ b/src/test/rustdoc-gui/sidebar-mobile.goml
@@ -8,3 +8,13 @@ assert-css: (".sidebar-elems", {"display": "block", "left": "-246px"})
 // Opening the sidebar menu.
 click: ".sidebar-menu"
 assert-css: (".sidebar-elems", {"display": "block", "left": "0px"})
+// Closing the sidebar menu.
+click: ".sidebar-menu"
+assert-css: (".sidebar-elems", {"display": "block", "left": "-246px"})
+// Force the sidebar open by focusing a link inside it.
+// This makes it easier for keyboard users to get to it.
+focus: ".sidebar-title"
+assert-css: (".sidebar-elems", {"display": "block", "left": "0px"})
+// When we tab out of the sidebar, close it.
+focus: ".search-input"
+assert-css: (".sidebar-elems", {"display": "block", "left": "-246px"})