Blame content/assets/css/bootstrap/_component-animations.scss

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//
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// Component animations
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// --------------------------------------------------
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// Heads up!
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//
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// We don't use the `.opacity()` mixin here since it causes a bug with text
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// fields in IE7-8. Source: https://github.com/twitter/bootstrap/pull/3552.
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.fade {
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  opacity: 0;
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  @include transition(opacity .15s linear);
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  &.in {
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    opacity: 1;
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  }
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}
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.collapse {
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  display: none;
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  &.in {
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    display: block;
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  }
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}
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.collapsing {
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  position: relative;
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  height: 0;
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  overflow: hidden;
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  @include transition(height .35s ease);
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}