jquery.cssanimateauto/test/cssTest.css

A jQuery plugin that uses CSS transitions to animate an element's height or width to or from auto.

.content {
  background: lightgray;
  height: 0;
  overflow: hidden;
}

#content-h-restricted {
  width: 200px;
}

.content.m-width {
  width: 0;
}

#content-w-restricted {
  height: 50px;
}

#content-w-min {
  min-height: 50px;
}

#content-closed-height {
  height: 30px;
}

.different-open-class {
  background: black;
  color: white;
}

#content-h-starting {
  height: auto;
}