calc() not working within media queries

Question

@media screen and (max-width: calc(2000px-1px)) { 
  .col { width: 200px; }
}

The value after subtraction s

Answer 1

ANSWER WAS EDITED 13.02.2018:

Using calc in media queries is supported by the spec, but support was only implemented by browsers recently (February 2018). Currently, calc in media queries is supported by Safari Technology Preview 49+, Chrome 66+, and Firefox 59+. See MDN's calc() page for the most up-to-date information.