If enabled, a user will be able to subscribe to receive their alerts via devices which are compatible with the Push API. Users will only be able to enable push notifications if they are using a compatible device. This is supported by most modern browsers.<br />
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<strong>Note:</strong> You can only enable this option if you have the <a href="https://secure.php.net/manual/en/book.gmp.php" target="_blank"><code>gmp</code></a>, <a href="https://secure.php.net/manual/en/book.mbstring.php" target="_blank"><code>mbstring</code></a> and <a href="https://secure.php.net/manual/en/book.openssl.php" target="_blank"><code>openssl</code></a> extensions enabled and have HTTPS enabled.