Improve security by protecting target=_blank

Change-Id: Ifec199f7d535eff757106a96543acb3d4adae38c
diff --git a/dev/js/src/match/info.js b/dev/js/src/match/info.js
index 7880a63..703e133 100644
--- a/dev/js/src/match/info.js
+++ b/dev/js/src/match/info.js
@@ -252,6 +252,7 @@
                 a.setAttribute('href', 'data:image/svg+xml;base64,'+treeObj.toBase64());
                 a.setAttribute('download', 'tree.svg');
                 a.target = '_blank';
+                a.setAttribute('rel', 'noopener noreferrer');
                 
                 document.body.appendChild(a);
                 a.click();