This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The visibilityState read-only property of the WindowClient interface indicates the visibility of the current client. This value can be one of hidden, visible, prerender, or unloaded.
myVisState = WindowClient.visibilityState;
A DOMString.
event.waitUntil(clients.matchAll({
type: "window"
}).then(function(clientList) {
for (var i = 0; i < clientList.length; i++) {
var client = clientList[i];
if (client.url == '/' && 'focus' in client) {
if(visibilityState === 'hidden')
return client.focus();
}
}
}
if (clients.openWindow)
return clients.openWindow('/');
}));
}); | Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'WindowClient' in that specification. | Editor's Draft | Initial definition. |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 42.0 | 44.0 (44.0)[1] | No support | ? | No support |
| Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 44.0 (44.0) | (Yes) | No support | ? | No support | 42.0 |
[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)
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https://developer.mozilla.org/en-US/docs/Web/API/WindowClient/visibilityState