DETECT WHEN USER SWITCHES A TAB
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
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<script>
document.addEventListener('visibilitychange' ,function(){
if (document.visibilityState == "visible") {
document.title = "active tab"
}else{
document.title = "inactive tab"
}
})
</script>
</body>
</html>
WATCH THIS VIDEO TO SEE HOW IT WORKS
this code changes the title of the document inactive tab when the user goes to another tab
otherwise when user is on the same page then it shows the title as active tab
this is useful when you create an application for conducting online exam
somepeople malpractice by switching the tab and searching the anwer in google and then writing it in exam
so this can be avoided by calling a function to submit exam when user switches to another tab (i changed title in that place you can call a function)
so from next onwards he may write exam without any cheating
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