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diff --git a/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/reset-filter.less b/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/reset-filter.less
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+++ b/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/reset-filter.less
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+// Reset filters for IE
+//
+// When you need to remove a gradient background, do not forget to use this to reset
+// the IE filter for IE9 and below.
+
+.reset-filter() {
+  filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
+}