To anyone asking why this was submitted: This is actually a breakthrough for a CSS problem that has annoyed frontend developers for a long time, as you can see

To anyone asking why this was submitted: This is actually a breakthrough for a CSS problem that has annoyed frontend developers for a long time, as you can see in this stackoverflow question: https://stackoverflow.com/questions/3508605/how-can-i-transition-height-0-to-height-auto-using-css https://stackoverflow.com/questions/3508605/how-can-i-transi... It does not make use of any new CSS features, but uses long existing features in a very clever way.