--- a/Platforms/Wasm/wasm-application-runner.ts	Mon Mar 25 15:23:45 2019 +0100
+++ b/Platforms/Wasm/wasm-application-runner.ts	Fri Mar 29 15:21:33 2019 +0100
@@ -107,7 +107,7 @@
     // Prevent scrolling
     document.body.addEventListener('touchmove', function (event) {
       event.preventDefault();
-    }, { passive: false});
+    }, { passive: false}); // must not be passive if calling event.preventDefault, ie to cancel scroll or zoom of the whole interface
 
     _InitializeWasmApplication(orthancBaseUrl);
   });