source/misc/embedded_libs/fmt-8.1.1/doc/bootstrap/mixins/tab-focus.less
browsing at commit = c253d62019e402b6da7066a52f6dcd0b9ced8cbe
// WebKit-style focus
.tab-focus() {
// Default
outline: thin dotted;
// WebKit
outline: 5px auto -webkit-focus-ring-color;
outline-offset: -2px;
}