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visuallyhidden.css

.visuallyhidden,
.mobile-navigation-trigger b {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

/*
 * example of usage:
 * <button class="mobile-navigation-trigger">
 *   <b class="visually-hidden">Open the navigation</b>
 *   <img src="img/mobile-navigation-icon.svg">
 * </button>
*/

visuallyhidden.scss

// ----
// Sass (v3.3.0.rc.2)
// Compass (v1.0.0.alpha.17)
// ----

// https://raw.github.com/h5bp/html5-boilerplate/master/css/main.css
.visuallyhidden,
%visuallyhidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}
/*
 * example of usage:
 * <button class="mobile-navigation-trigger">
 *   <b class="visually-hidden">Open the navigation</b>
 *   <img src="img/mobile-navigation-icon.svg">
 * </button>
*/

.mobile-navigation-trigger b {
  @extend %visuallyhidden;
}