File: core/assets/build/bootstrap-less/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; // Override Firefox's unusual default opacity; 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;
}