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@placeholder-ruleset: { text-transform: uppercase; };
.placeholder(@color-01, @placeholder-ruleset);

/**/
.placeholder(@color, @ruleset: {}) {
  ::-webkit-input-placeholder {
    color: @color;
    @ruleset();
  }

  ::-moz-placeholder {
    color: @color;
    @ruleset();
  } /* firefox 19+ */

  :-ms-input-placeholder {
    color: @color;
    @ruleset();
  } /* ie */

  input:-moz-placeholder {
    color: @color;
    @ruleset();
  }
}