diff --git a/godoc/static/godocs.js b/godoc/static/godocs.js
index 1fb8b91e..3ce27ea6 100644
--- a/godoc/static/godocs.js
+++ b/godoc/static/godocs.js
@@ -263,7 +263,14 @@ function personalizeInstallInstructions() {
   var prefix = '?download=';
   var s = window.location.search;
   if (s.indexOf(prefix) != 0) {
-    // No 'download' query string; bail.
+    // No 'download' query string; detect "test" instructions from User Agent.
+    if (navigator.platform.indexOf('Win') != -1) {
+      $('.testUnix').hide();
+      $('.testWindows').show();
+    } else {
+      $('.testUnix').show();
+      $('.testWindows').hide();
+    }
     return;
   }
 
diff --git a/godoc/static/static.go b/godoc/static/static.go
index a47a7fd0..6fab8da3 100644
--- a/godoc/static/static.go
+++ b/godoc/static/static.go
@@ -833,7 +833,14 @@ function personalizeInstallInstructions() {
   var prefix = '?download=';
   var s = window.location.search;
   if (s.indexOf(prefix) != 0) {
-    // No 'download' query string; bail.
+    // No 'download' query string; detect "test" instructions from User Agent.
+    if (navigator.platform.indexOf('Win') != -1) {
+      $('.testUnix').hide();
+      $('.testWindows').show();
+    } else {
+      $('.testUnix').show();
+      $('.testWindows').hide();
+    }
     return;
   }