1 files changed, 4 insertions, 0 deletions
diff --git a/js/app.js b/js/app.js
index 96faa7b..a9f7bb7 100644
--- a/js/app.js
+++ b/js/app.js
@@ -56,6 +56,10 @@ function bind () {
 		if (current_tool.name != 'shader') { cursor_input.focus() }
 		document.body.classList.remove('loading')
 	})
+	
+	window.onbeforeunload = function() {
+		return "Are you sure you want to navigate away?";
+	}
 }
 
 init()