sass-toolkit/tests/controls/14-viewport.css

Think of Toolkit as your swiss army knife for modern design and development.

/**
  * Viewport
**/
.viewport {
  _test: "@at-root { @include viewport { width: 320px auto; }}";
}
@-webkit-viewport {
  width: 320px auto;
}
@-moz-viewport {
  width: 320px auto;
}
@-ms-viewport {
  width: 320px auto;
}
@viewport {
  width: 320px auto;
}