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.placeholder(@color: @input-placeholder-color) { // Firefox &::-moz-placeholder { color: @color; opacity: 1; // Override Firefox's unusual default opacity; see https://github.com/twbs/bootstrap/pull/11526 } // Internet Explorer 10+ &:-ms-input-placeholder { color: @color; } // Safari and Chrome &::-webkit-input-placeholder { color: @color; } }