https://developer.mozilla.org/en-US/docs/Web/API/PushManager/hasPermission
PushManager: hasPermission() method - Web APIs | MDN
The PushManager.hasPermission() method of the PushManager interface returns a Promise that resolves to the PushPermissionStatus of the requesting webapp, which...
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https://caniuse.com/?search=PushManager%20API
"PushManager API" | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
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