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Bootstrap/scss/mixins/_caret.scss

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@mixin caret-down {
border-top: $caret-width solid;
border-right: $caret-width solid transparent;
border-bottom: 0;
border-left: $caret-width solid transparent;
}
@mixin caret-up {
border-top: 0;
border-right: $caret-width solid transparent;
border-bottom: $caret-width solid;
border-left: $caret-width solid transparent;
}
@mixin caret-right {
border-top: $caret-width solid transparent;
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border-right: 0;
border-bottom: $caret-width solid transparent;
border-left: $caret-width solid;
}
@mixin caret-left {
border-top: $caret-width solid transparent;
border-right: $caret-width solid;
border-bottom: $caret-width solid transparent;
}
@mixin caret($direction: down) {
@if $enable-caret {
&::after {
display: inline-block;
margin-left: $caret-width * .85;
vertical-align: $caret-width * .85;
content: "";
@if $direction == down {
@include caret-down;
} @else if $direction == up {
@include caret-up;
} @else if $direction == right {
@include caret-right;
}
}
@if $direction == left {
&::after {
display: none;
}
&::before {
display: inline-block;
margin-right: $caret-width * .85;
vertical-align: $caret-width * .85;
content: "";
@include caret-left;
}
}
&:empty::after {
margin-left: 0;
}
}
}