Bootstrap/docs/3.4/assets/css/ie10-viewport-bug-workaround.css

/*!
 * IE10 viewport hack for Surface/desktop Windows 8 bug
 * Copyright 2014-2019 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 */
@-ms-viewport {
  width: device-width;
}
@-o-viewport {
  width: device-width;
}
@viewport {
  width: device-width;
}