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並前往https://dev.opera.com/blog/page-visibility-api-support-in-opera-12-10/

Page Visibility API Support in Opera 12.10

visibilityState attribute simply reveals the particular state of a ... When the visibility state of a document changes, Opera fires a ...

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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
    5.
  5. Pagehide
    6.
  6. Pageshow
    7.
  7. Document hasFocus
    8.
  8. Pageshow event
    9.