twbs--bootstrap/scss/_utilities-responsive.scss

//
// Responsive: Utility classes
// --------------------------------------------------

@each $bp in map-keys($grid-breakpoints) {
  .hidden-#{$bp}-up {
    @include media-breakpoint-up($bp) {
      display: none !important;
    }
  }
  .hidden-#{$bp}-down {
    @include media-breakpoint-down($bp) {
      display: none !important;
    }
  }
}


// IE10 in Windows (Phone) 8
//
// Support for responsive views via media queries is kind of borked in IE10, for
// Surface/desktop in split view and for Windows Phone 8. This particular fix
// must be accompanied by a snippet of JavaScript to sniff the user agent and
// apply some conditional CSS to *only* the Surface/desktop Windows 8. Look at
// our Getting Started page for more information on this bug.
//
// For more information, see the following:
//
// Issue: https://github.com/twbs/bootstrap/issues/10497
// Docs: http://getbootstrap.com/getting-started/#support-ie10-width
// Source: http://timkadlec.com/2013/01/windows-phone-8-and-device-width/
// Source: http://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/

@-ms-viewport {
  width: device-width;
}


// Print utilities
//
// Media queries are placed on the inside to be mixin-friendly.

.visible-print-block {
  display: none !important;

  @media print {
    display: block !important;
  }
}
.visible-print-inline {
  display: none !important;

  @media print {
    display: inline !important;
  }
}
.visible-print-inline-block {
  display: none !important;

  @media print {
    display: inline-block !important;
  }
}

.hidden-print {
  @media print {
    @include responsive-invisibility(".hidden-print");
  }
}