bottom_percent 属性测试 | W3Schools 在线编辑器

结果:

Play with different bottom values for this yellow DIV element.

Note: To "bottom" positioning elements using % (percent) values, use position:absolute.

CSS 代码:

div#myBox {
  background-color:yellow;
  width:100px;
  position:absolute;
  bottom:0px;
}