Extends the vanilla Bootstrap .sr-only and .sr-only-focusable classes to function with media-breakpoint mixins.
The classes follow the pattern sr-[breakpoint]-[query-type] and sr-[breakpoint]-[query-type]-focusable.
The query types use the provided media queries aside from the "between" query:
only: to target only the selected breakpointup: to target the selected breakpoint and anything largerdown: to target the select breakpoint and anything smaller
.sr-md-only
.sr-md-up
.sr-md-down
.sr-md-only-focusable
.sr-md-up-focusable
.sr-md-down-focusable@import 'path/to/node_modules/bootstrap-scss-plugins/scss/screen-reader-breakpoints';<p class="sr-md-up">This is some text that can been seen on small and smaller screens.</p>