Hidden Mixins

_hidden.sass

// Hide from both screenreaders and browsers: h5bp.com/u
// Probably don't use this one

.hidden {
    display: none !important;
    visibility: hidden;
}


// Hide only visually, but have it available for screenreaders: h5bp.com/v
// Probably use this one

.visually-hidden {
    border: 0;
    clip: rect(0 0 0 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
}

// Extends the .visuallyhidden class to allow the element to be focusable
// when navigated to via the keyboard: h5bp.com/p

.visually-hidden.focusable:active,
.visually-hidden.focusable:focus {
    clip: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    position: static;
    width: auto;
}

// Hide visually and from screenreaders, but maintain layout
// Use this one rarely.

.invisible {
    visibility: hidden;
}

Based on _hidden.scss from Mortar
https://github.com/natgeo/mortar