How can I determine if an alert is displayed on a web page using Javascript and then dismiss it?

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To determine if an alert is displayed on a web page using JavaScript, you can check if the alert function has been called. To dismiss the alert, you can use the window.confirm or window.setTimeout function.

Here's an example code:

if(typeof alert !== 'undefined'){
  alert('This is an alert');
  // use window.setTimeout to dismiss the alert after a certain amount of time
  window.setTimeout(function(){
    alert.dismiss();
  }, 5000);
} else {
  console.log('There is no alert on this page');
}

In this code snippet, we first check to see if the alert function exists. If it does, then we call the alert function with a message. We then use window.setTimeout to dismiss the alert after 5 seconds by calling the alert.dismiss method.

If the alert function doesn't exist, we log a message to the console indicating that there is no alert on the page.

Note that dismissing an alert using JavaScript may not always work, as it depends on the browser and the specific implementation of the alert function.