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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/twbs/bootstrap/pull/3552.
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							.fade {
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							  opacity: 0;
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							  .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      { display: block; }
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							  tr&.in    { display: table-row; }
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							  tbody&.in { display: table-row-group; }
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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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							  .transition(height .35s ease);
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							}
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