firefox - What happens to code after a javascript redirect (setting window.location.href)?

Question

I have the following javascript redirect code followed by some more code.

window.location.href = '/someurl';
alert('hello');
alert('hello again');

This causes a browser inconsistency.

In firefox, the first alert is visible for a split second right before getting redirected. The second alert is not visible at all.

In chrome, both alerts will pop up, and the redirect happens only after clicking ok for both alerts.

Is there some concept of what happens to code after the redirect that can resolve these differences? If the redirect is asynchronous, then what is chrome doing? I would like to understand what is happening so that I can determine what to do in a more complicated scenario where a redirect is buried deep within some callbacks and other logic.

Answer 1

The Javascript session will struggle to continue it's mission in the face of impending doom. Coding in this manner is considered unpredictable. ...and cruel.