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understrap/src/sass/bootstrap4/mixins/_screen-reader.scss

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// Only display content to screen readers
//
// See: http://a11yproject.com/posts/how-to-hide-content
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// See: http://hugogiraudel.com/2016/10/13/css-hide-and-seek/
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@mixin sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
overflow: hidden;
clip: rect(0,0,0,0);
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white-space: nowrap;
clip-path: inset(50%);
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border: 0;
}
// Use in conjunction with .sr-only to only display content when it's focused.
//
// Useful for "Skip to main content" links; see https://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
//
// Credit: HTML5 Boilerplate
@mixin sr-only-focusable {
&:active,
&:focus {
position: static;
width: auto;
height: auto;
overflow: visible;
clip: auto;
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white-space: normal;
clip-path: none;
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}
}