checkVisibility()
Starts a page visibility event listener running, or window.onpagehide/onpageshow if not supported by the browser.
Also listens for window.onblur and window.onfocus.
- Source code: core/Stage.js (Line 221)
checkVisibility()
Starts a page visibility event listener running, or window.onpagehide/onpageshow if not supported by the browser.
Also listens for window.onblur and window.onfocus.
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