/usr/share/javascript/bootstrap/less/mixins/tab-focus.less is in libjs-bootstrap 3.3.7+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | // WebKit-style focus
.tab-focus() {
// WebKit-specific. Other browsers will keep their default outline style.
// (Initially tried to also force default via `outline: initial`,
// but that seems to erroneously remove the outline in Firefox altogether.)
outline: 5px auto -webkit-focus-ring-color;
outline-offset: -2px;
}
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