It's funny how Facebook used a similar technique in the past,
Imagine you opened facebook.com, scrolled through your feed for a bit and then decided to open a new tab to read some news. Even though there were updates on your Facebook feed while you were away, they wouldn't display until you clicked back on the Facebook tab. Only when you switched tabs would it trigger the event to fetch the latest feed updates.
Do you know how this was achieved?
To determine if the browser window has focus, you can utilize JavaScript to detect this event. Typically, dynamic updates on a page or AJAX calls only occur when the browser window is active. For more information on detecting browser window focus in JavaScript, check out:
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