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Web Push Notifications don't work in incognito mode. The method will give a false result when the browser is in that mode.

personaclick("subscription", "web_push_supported", callback);

personaclick("subscription", "web_push_supported", function(supported) {
    if (supported) {
        // if Web Push is supported
    } else {
        // if Web Push isn't supported
    }
});

personaclick("subscription", "web_push_subscribed", callback);

personaclick("subscription", "web_push_subscribed", function(subscibed) {
    if (subscibed) {
        // if the user has permitted Web Push notifications
    } else {
        // if the user hasn't yet permitted Web Push notifications or has rejected the request
    }
});

We recommend using the Programmatic Pop-Ups tool for more flexibility in configuring the user's subscription to Web Push notifications.

personaclick("subscription", "web_push_subscribe", callback);

personaclick("subscription", "web_push_subscribe", function(subscibed) {
    if (subscibed) {
        // if the user has subscribed to Web Push notifications
    } else {
        // if the user rejects the Web Push notification subscription
    }
});