freeCodeCamp/client/less/lib/bootstrap/mixins/vendor-prefixes.less

// Vendor Prefixes
//
// All vendor mixins are deprecated as of v3.2.0 due to the introduction of
// Autoprefixer in our Gruntfile. They will be removed in v4.

// - Animations
// - Backface visibility
// - Box shadow
// - Box sizing
// - Content columns
// - Hyphens
// - Placeholder text
// - Transformations
// - Transitions
// - User Select


// Animations
.animation(@animation) {
  -webkit-animation: @animation;
       -o-animation: @animation;
          animation: @animation;
}
.animation-name(@name) {
  -webkit-animation-name: @name;
          animation-name: @name;
}
.animation-duration(@duration) {
  -webkit-animation-duration: @duration;
          animation-duration: @duration;
}
.animation-timing-function(@timing-function) {
  -webkit-animation-timing-function: @timing-function;
          animation-timing-function: @timing-function;
}
.animation-delay(@delay) {
  -webkit-animation-delay: @delay;
          animation-delay: @delay;
}
.animation-iteration-count(@iteration-count) {
  -webkit-animation-iteration-count: @iteration-count;
          animation-iteration-count: @iteration-count;
}
.animation-direction(@direction) {
  -webkit-animation-direction: @direction;
          animation-direction: @direction;
}
.animation-fill-mode(@fill-mode) {
  -webkit-animation-fill-mode: @fill-mode;
          animation-fill-mode: @fill-mode;
}

// Backface visibility
// Prevent browsers from flickering when using CSS 3D transforms.
// Default value is `visible`, but can be changed to `hidden`

.backface-visibility(@visibility){
  -webkit-backface-visibility: @visibility;
     -moz-backface-visibility: @visibility;
          backface-visibility: @visibility;
}

// Drop shadows
//
// Note: Deprecated `.box-shadow()` as of v3.1.0 since all of Bootstrap's
// supported browsers that have box shadow capabilities now support it.

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

// Box sizing
.box-sizing(@boxmodel) {
  -webkit-box-sizing: @boxmodel;
     -moz-box-sizing: @boxmodel;
          box-sizing: @boxmodel;
}

// CSS3 Content Columns
.content-columns(@column-count; @column-gap: @grid-gutter-width) {
  -webkit-column-count: @column-count;
     -moz-column-count: @column-count;
          column-count: @column-count;
  -webkit-column-gap: @column-gap;
     -moz-column-gap: @column-gap;
          column-gap: @column-gap;
}

// Optional hyphenation
.hyphens(@mode: auto) {
  word-wrap: break-word;
  -webkit-hyphens: @mode;
     -moz-hyphens: @mode;
      -ms-hyphens: @mode; // IE10+
       -o-hyphens: @mode;
          hyphens: @mode;
}

// Placeholder text
.placeholder(@color: @input-color-placeholder) {
  // Firefox
  &::-moz-placeholder {
    color: @color;
    opacity: 1; // See https://github.com/twbs/bootstrap/pull/11526
  }
  &:-ms-input-placeholder { color: @color; } // Internet Explorer 10+
  &::-webkit-input-placeholder  { color: @color; } // Safari and Chrome
}

// Transformations
.scale(@ratio) {
  -webkit-transform: scale(@ratio);
      -ms-transform: scale(@ratio); // IE9 only
       -o-transform: scale(@ratio);
          transform: scale(@ratio);
}
.scale(@ratioX; @ratioY) {
  -webkit-transform: scale(@ratioX, @ratioY);
      -ms-transform: scale(@ratioX, @ratioY); // IE9 only
       -o-transform: scale(@ratioX, @ratioY);
          transform: scale(@ratioX, @ratioY);
}
.scaleX(@ratio) {
  -webkit-transform: scaleX(@ratio);
      -ms-transform: scaleX(@ratio); // IE9 only
       -o-transform: scaleX(@ratio);
          transform: scaleX(@ratio);
}
.scaleY(@ratio) {
  -webkit-transform: scaleY(@ratio);
      -ms-transform: scaleY(@ratio); // IE9 only
       -o-transform: scaleY(@ratio);
          transform: scaleY(@ratio);
}
.skew(@x; @y) {
  -webkit-transform: skewX(@x) skewY(@y);
      -ms-transform: skewX(@x) skewY(@y); // See https://github.com/twbs/bootstrap/issues/4885; IE9+
       -o-transform: skewX(@x) skewY(@y);
          transform: skewX(@x) skewY(@y);
}
.translate(@x; @y) {
  -webkit-transform: translate(@x, @y);
      -ms-transform: translate(@x, @y); // IE9 only
       -o-transform: translate(@x, @y);
          transform: translate(@x, @y);
}
.translate3d(@x; @y; @z) {
  -webkit-transform: translate3d(@x, @y, @z);
          transform: translate3d(@x, @y, @z);
}
.rotate(@degrees) {
  -webkit-transform: rotate(@degrees);
      -ms-transform: rotate(@degrees); // IE9 only
       -o-transform: rotate(@degrees);
          transform: rotate(@degrees);
}
.rotateX(@degrees) {
  -webkit-transform: rotateX(@degrees);
      -ms-transform: rotateX(@degrees); // IE9 only
       -o-transform: rotateX(@degrees);
          transform: rotateX(@degrees);
}
.rotateY(@degrees) {
  -webkit-transform: rotateY(@degrees);
      -ms-transform: rotateY(@degrees); // IE9 only
       -o-transform: rotateY(@degrees);
          transform: rotateY(@degrees);
}
.perspective(@perspective) {
  -webkit-perspective: @perspective;
     -moz-perspective: @perspective;
          perspective: @perspective;
}
.perspective-origin(@perspective) {
  -webkit-perspective-origin: @perspective;
     -moz-perspective-origin: @perspective;
          perspective-origin: @perspective;
}
.transform-origin(@origin) {
  -webkit-transform-origin: @origin;
     -moz-transform-origin: @origin;
      -ms-transform-origin: @origin; // IE9 only
          transform-origin: @origin;
}


// Transitions

.transition(@transition) {
  -webkit-transition: @transition;
       -o-transition: @transition;
          transition: @transition;
}
.transition-property(@transition-property) {
  -webkit-transition-property: @transition-property;
          transition-property: @transition-property;
}
.transition-delay(@transition-delay) {
  -webkit-transition-delay: @transition-delay;
          transition-delay: @transition-delay;
}
.transition-duration(@transition-duration) {
  -webkit-transition-duration: @transition-duration;
          transition-duration: @transition-duration;
}
.transition-timing-function(@timing-function) {
  -webkit-transition-timing-function: @timing-function;
          transition-timing-function: @timing-function;
}
.transition-transform(@transition) {
  -webkit-transition: -webkit-transform @transition;
     -moz-transition: -moz-transform @transition;
       -o-transition: -o-transform @transition;
          transition: transform @transition;
}


// User select
// For selecting text on the page

.user-select(@select) {
  -webkit-user-select: @select;
     -moz-user-select: @select;
      -ms-user-select: @select; // IE10+
          user-select: @select;
}