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並前往https://responsivedesign.is/news/2020/03/introducing-the-page-visibility-api/

Introducing the Page Visibility API - Responsive Web Design

We can listen to the visibilitychange event and then get the visibility state with d ocument.visibilityState and so what we want with it.

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查詢 「visibilityState」的人也找了：

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