“There is a difference between support and optimisation”
Brad Frost, Aug 7, 2012
https://www.slideshare.net/bradfrostweb/beyond-media-queries-anatomy-of-an-adaptive-web-design/57
Browser compatibility statement
The website will be optimised for modern browsers, with older versions of browsers being supported. Optimised means full functionality and layout is tested and ensured in modern browsers. Supported means full functionality isn’t always possible, and the layout may not be identical to modern browsers and so will degrade gracefully. The content always remains accessible.