diff --git a/src/test/html/summit.html b/src/test/html/summit.html
index d995aebaa3f..a50f18ea016 100644
--- a/src/test/html/summit.html
+++ b/src/test/html/summit.html
@@ -3,17 +3,17 @@
     <title>Summit demo page</title>
   </head>
 <body>
-  <iframe sandbox="allow-scripts" src="filmstrip.html" style="display:block; border: 1px; width: 200px; height: 200px"
+  <iframe sandbox="allow-scripts" src="filmstrip.html" style="display:block; border: 1px solid black; width: 200px; height: 200px"
           frameborder="yes" scrolling="yes"></iframe>
 
-  <iframe sandbox="allow-scripts" src="longcat.html" style="display:block; border: 1px; width: 600px; height: 600px"
+  <iframe sandbox="allow-scripts" src="longcat.html" style="display:block; border: 1px solid black; width: 600px; height: 600px"
           frameborder="yes" scrolling="yes"></iframe>
 
   <iframe sandbox="allow-scripts" src="test_sandboxed_iframe.html"
-          style="display:block; border: 1px; width: 300px; height: 300px">
+          style="display:block; border: 1px solid black; width: 300px; height: 300px">
   </iframe>
 
-  <iframe src="summit-link.html" style="display:block; border: 1px; width: 300px; height: 300px"
+  <iframe src="summit-link.html" style="display:block; border: 1px solid black; width: 300px; height: 300px"
           frameborder="yes" scrolling="yes">
   </iframe>
 </body>
