Currently I'm using jQuery 1.8.1. I'm going to upgrade to 3.0 for security reasons. When I see the document of https://jquery.com/upgrade-guide/3.0/#browser-support, it's saying Chrome, Edge, Firefox, Safari: Current and Current - 1 But I'm not sure what it means.

1. ex. Google chrome : 65.0.3325.181 jquery 3.0 compatible to 64.0.x but not previous versions?
2. current means the time when jQuery 3.0 released?