User:Enews/Common.js

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$(function () {
    var originalTitle = document.title;
    var pageName = mw.config.get("wgTitle"); 
    var awayTitle = "👋Continue reading" + pageName;
    var welcomeTitle = "🎉 Welcome Back! ";
    var timeout;

    document.addEventListener("visibilitychange", function () {
        if (document.hidden) {
            // When leaving
            document.title = awayTitle;
            clearTimeout(timeout);
        } else {
            // When returning
            document.title = welcomeTitle;
            clearTimeout(timeout);
            timeout = setTimeout(function () {
                document.title = originalTitle;
            }, 2000); // lasts for 1700ms
        }
    });
});