I got the observation by my experiment, which I posted public previously at
I have created a GitHub repository; with it you can reproduce my findings .
You need to start a tiny HTTP server locally.
$ cd ks_AlertDialogueDisappears
$ groovy server.groovy
The server.groovy is dependent on the version of Groovy. You must have Groovy v2.4.x installed
$ groovy --version
Groovy Version: 2.4.21 JVM: 11.0.18 Vendor: Amazon.com Inc. OS: Mac OS X
Then you want to run Test Cases/testAlert while specifying type of browsers: Chrome, FF, Safari, …