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.input::-webkit-input-placeholder, .input::-moz-placeholder, .input:-moz-placeholder, .input:-ms-input-placeholder {
  color: red;
}

::-webkit-input-placeholder,
::-moz-placeholder,
:-moz-placeholder,
:-ms-input-placeholder {
  color: blue;
}

// ----
// libsass (v3.3.2)
// ----

@mixin placeholder {
  &::-webkit-input-placeholder,
  &::-moz-placeholder,
  &:-moz-placeholder,
  &:-ms-input-placeholder {
    @content;
  }
}

.input {
  @include placeholder {
    color: red;
  }
}

@include placeholder {
  color: blue;
}