Document.hidden

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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Document.hidden 읽기 전용 속성은 페이지가 숨겨졌는지 여부를 Boolean 값으로 나타냅니다.

예제

document.addEventListener("visibilitychange", function () {
  console.log(document.hidden);
  // 숨김 여부가 변했을 때의 행동
});

Specification
HTML # dom-document-hidden