//
// @file
// Accessibility features.
//

// As defined by http://snook.ca/archives/html_and_css/hiding-content-for-accessibility
@mixin visually-hidden {
  position: absolute !important;
  height: 1px;
  width: 1px;
  overflow: hidden;
  @if $legacy-support-for-ie6 or $legacy-support-for-ie7 {
    clip: rect(1px 1px 1px 1px); // IE6 and IE7 use the wrong syntax.
  }
  clip: rect(1px, 1px, 1px, 1px);
}

// Turns off the visually-hidden effect.
@mixin visually-hidden-off {
  position: static !important;
  clip: auto;
  height: auto;
  width: auto;
  overflow: auto;
}

// Makes an element visually hidden, except when it receives focus.
@mixin visually-focusable {
  @include visually-hidden();

  &:active,
  &:focus {
    @include visually-hidden-off();
  }
}

// Placeholder styles for use with @extend.
%visually-hidden {
  @include visually-hidden();
}
%visually-hidden-off {
  @include visually-hidden-off();
}
%visually-focusable {
  @extend %visually-hidden;

  &:active,
  &:focus {
    @extend %visually-hidden-off;
  }
}