How to tell if browser/tab is active [duplicate]

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In addition to Richard Simões answer you can also use the Page Visibility API.

if (!document.hidden) {
    // do what you need
}

This specification defines a means for site developers to
programmatically determine the current visibility state of the page in
order to develop power and CPU efficient web applications.

Learn more (2019 update)

  • All modern browsers are supporting document.hidden
  • http://davidwalsh.name/page-visibility
  • https://developers.google.com/chrome/whitepapers/pagevisibility
  • Example pausing a video when window/tab is hidden
    https://web.archive.org/web/20170609212707/http://www.samdutton.com/pageVisibility/

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