// Webkit-style focus
.tab-focus() {
  // Default
  outline: thin dotted #333;
  // Webkit
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}

// Drop shadows
.box-shadow(@shadow) {
  -webkit-box-shadow: @shadow; // iOS <4.3 & Android <4.1
          box-shadow: @shadow;
}

// Opacity
.opacity(@opacity) {
  opacity: @opacity;
  // IE8 filter
  @opacity-ie: (@opacity * 100);
  filter: ~"alpha(opacity=@{opacity-ie})";
}


// Transitions
.transition(@transition) {
  -webkit-transition: @transition;
     -moz-transition: @transition;
       -o-transition: @transition;
          transition: @transition;
}
.transition-delay(@transition-delay) {
  -webkit-transition-delay: @transition-delay;
     -moz-transition-delay: @transition-delay;
       -o-transition-delay: @transition-delay;
          transition-delay: @transition-delay;
}
.transition-duration(@transition-duration) {
  -webkit-transition-duration: @transition-duration;
     -moz-transition-duration: @transition-duration;
       -o-transition-duration: @transition-duration;
          transition-duration: @transition-duration;
}
.user-select(@select) {
  -webkit-user-select: @select;
     -moz-user-select: @select;
      -ms-user-select: @select;
       -o-user-select: @select;
          user-select: @select;
}


.transition-property(...) {
  -webkit-transition-property: @arguments;
     -moz-transition-property: @arguments;
       -o-transition-property: @arguments;
          transition-property: @arguments;
}


.transition-timing-function(@transition-timing-function) {
  -webkit-transition-timing-function: @transition-timing-function;
     -moz-transition-timing-function: @transition-timing-function;
       -o-transition-timing-function: @transition-timing-function;
          transition-timing-function: @transition-timing-function;
}

// Transitions
.transform(@arguments) {
  -webkit-transition: -webkit-transform @arguments;
     -moz-transition:    -moz-transform @arguments;
       -o-transition:      -o-transform @arguments;
          transition:         transform @arguments;
}