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並前往https://tracker.zkoss.org/browse/ZK-1474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Add onVisibilityChange event based on HTML5 page-visibility ...

this feature annoyed me when I am developing and close the server. the tab will pop up a alert window and take the focus back to the tab,

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