Remove Admin Notice on page refresh

by

This is done by wp_admin_canonical_url:

  • It calls wp_removable_query_args to fetch a list of query string parameters to remove, which includes settings-updated.

  • It then writes some script into the page header to use window.history.replaceState to remove the query string from your browser’s URL bar.

    <link id="wp-admin-canonical" rel="canonical"
      href="http://example.com/wp-admin/admin.php?page=xyz">
<script>
    if ( window.history.replaceState ) {
        window.history.replaceState( null, null,
            document.getElementById( 'wp-admin-canonical' ).href +
                window.location.hash );
    }
</script>

If you want to add your own arguments to the list that gets removed then you can hook removable_query_args.