How to track the opening of a tab?

Question

Web development

I need to make an ajax request every time I switch to a tab in the browser, i.e. if the user opened the site, then moved to another tab and returned to mine, the request is executed. How to track the moment when the user goes to the tab?

Answer 1

https://developer.mozilla.org/en-US/docs/Web/API/D...
works for both tabs and "saved to home screen" pwa-apps so that the data is loaded when the user opens the app again

Answer 2

window.onfocus and window.onblur, if I understood the task correctly. The first event will be executed when the user goes to the tab, the second - when he leaves it