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How to Detect Idle Browser Tabs with the Page Visibility API

document.visibilityState: a read-only attribute that returns a string value denoting the state of the tab/window: 'hidden' | 'visible' | ...

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查詢 「visibilityState」的人也找了：

  1. Visibilitychange
    2.
  2. Page Visibility API
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  3. Page Lifecycle API
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  4. onVisibilityChange
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  5. Pagehide
    6.
  6. Pageshow
    7.
  7. Document hasFocus
    8.
  8. Pageshow event
    9.