Important context from the article: Starting February 8, 2017, we will show a banner at the top of the Gmail interface for users who are still on Google

Important context from the article: Starting February 8, 2017, we will show a banner at the top of the Gmail interface for users who are still on Google Chrome Browser v53 and below to encourage upgrading to the latest version And Gmail will continue to function on Chrome Browser v53 and below through the end of the year. Users who remain on Chrome v53 and below could be redirected to the basic HTML version of Gmail as early as Dec 2017.