--- a/layout/tools/reftest/reftest.js
+++ b/layout/tools/reftest/reftest.js
@@ -266,17 +266,17 @@ this.OnRefTestLoad = function OnRefTestL
       gBrowser = gContainingWindow.document.createElementNS(XUL_NS, "xul:browser");
     }
     gBrowser.setAttribute("id", "browser");
     gBrowser.setAttribute("type", "content-primary");
     gBrowser.setAttribute("remote", gBrowserIsRemote ? "true" : "false");
     gBrowser.setAttribute("mozasyncpanzoom", "true");
     // Make sure the browser element is exactly 800x1000, no matter
     // what size our window is
-    gBrowser.setAttribute("style", "min-width: 800px; min-height: 1000px; max-width: 800px; max-height: 1000px");
+    gBrowser.setAttribute("style", "padding: 0px; margin: 0px; border:none; min-width: 800px; min-height: 1000px; max-width: 800px; max-height: 1000px");
 
 #ifdef BOOTSTRAP
 #ifdef REFTEST_B2G
     var doc = gContainingWindow.document.getElementsByTagName("html")[0];
 #else
     var doc = gContainingWindow.document.getElementById('main-window');
 #endif
     while (doc.hasChildNodes()) {