animation、transition、transform：rotate、skew。transform-origin
div{
animation:myAnimation 2s;
transform:rotate(30reg) skewX(30);
transform-origin:right top;
}
@keyframe myAnimation{
from{width:2px;}
to{width:20px;}
}
div{
transition:height 3s;
}
div:hover{
height:10px;
}