Can you use JavaScript to detect whether a user has closed a browser tab? closed a browser? or has left a browser?

To put you in the picture :

• A user is on a mobile device and is looking at a browser (i.e. Safari on an iPhone)


• They can see a password field to create a password in a modal box


• If the user were to close the modal box and come out of the browser I would like to send them an email to prompt them to create a password.

My initial thought is there must be some sort of java-script event to be able to do this ?

So can you detect the following user actions with JavaScript where a users has : - Closed a Tab - Closed their Browser - Left their browser

Many Thanks