CSS Mixin in LESS

CSS-Mixin-Less.less

.opacity (@opacity) {
    @opacityPercentage: @opacity * 100;
    opacity: @opacity;
    -ms-filter: ~"progid:DXImageTransform.Microsoft.Alpha(opacity=(@{opacityPercentage}))"; 
    filter: ~"alpha(opacity = (@{opacityPercentage}))";
}

.border-radius(@radius) {
    border-radius: @radius;
    -moz-border-radius: @radius;
    -webkit-border-radius: @radius;
}

.placeholder(@color) {
  ::-webkit-input-placeholder { /* WebKit browsers */
    color: @color;
  }
  :-moz-placeholder { /* Mozilla Firefox 4 to 18 */
    color: @color;
  }
  ::-moz-placeholder { /* Mozilla Firefox 19+ */
    color: @color;
  }
  :-ms-input-placeholder { /* Internet Explorer 10+ */
    color: @color;
  }
}

.nowrap {
    white-space: nowrap;
}

.longname() {
    .nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.inline-block {
    display: -moz-inline-stack;
    display: inline-block;
    zoom: 1;
    *display: inline;
}