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diff --git a/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/responsive-visibility.less b/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/responsive-visibility.less
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+++ b/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/responsive-visibility.less
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+// Responsive utilities
+
+//
+// More easily include all the states for responsive-utilities.less.
+.responsive-visibility() {
+  display: block !important;
+  table&  { display: table !important; }
+  tr&     { display: table-row !important; }
+  th&,
+  td&     { display: table-cell !important; }
+}
+
+.responsive-invisibility() {
+  display: none !important;
+}