Issue 4027 - make the download button available for windows insider users

static/js/index.js

 (function()
 {
   var visibleTab;
   var container;
 
   window.toggleMore = function()
   {
     if (container.className == "hidden")
       container.className = visibleTab || getDefaultTab();
     else
@@ skipping 11 matching lines @@
   {
     var content = document.getElementById("content");
     var ua = content.className.match(/ua\-([^\s]+)/);
     visibleTab = ua && ua[1] || "firefox";
     return visibleTab;
   }
 
   function init()
   {
     container = document.getElementById("more-container");
+    checkEdgeSupport();
+  }
+
+  function checkEdgeSupport()
+  {
+    var content = document.getElementById("content");
+    if(content.className.indexOf("edge") == -1 || !window.navigator.userAgent)

[Sebastian Noack, 2016/05/17 17:02:11]

If you put the check here below the UA check, it will be safe to use classList
here as well.

[Sebastian Noack, 2016/05/17 17:02:11]

Nit: Missing space after "if".

[saroyanm, 2016/05/18 12:03:41]

Done.

[saroyanm, 2016/05/18 12:03:41]

Done.

+      return;
+
+    var match = window.navigator.userAgent.match(/Edge\/(\d+.\d+)/);
+    if (match && parseFloat(match[1]) >= 14.14342)
+      content.classList.add("edge-supported");
   }
 
   init();
 })();