3 ms·Not 'official' and yet supported by all major browsers to this day.by arbuge 4y agoNot 'official' and yet supported by all major browsers to this day.cxr 4y agoIt is official.arbuge 4y agoMy bad. I was thinking of the refresh header, not the HTML meta refresh. The header I believe is not official but nevertheless supported by many browsers since Netscape Navigator. In PHP: header("Refresh:<delay in seconds>; url=<URL>");deleted 3y ago[deleted]