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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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.
Syntax
myVisState = WindowClient.visibilityState;
Value
A DOMString.
Example
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('/');
}));
});
Specifications
| Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'WindowClient' in that specification. |
Working Draft | Initial definition. |
Browser compatibility
| 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 Extended Support Release (ESR.)