DIV with position:绝对动态延伸到视区底部？

DIV with position: absolute extends dynamically to the bottom of the viewport by setting the bottom property to 0.

When a DIV is positioned absolutely, it is taken out of the normal document flow and positioned relative to its closest positioned ancestor or the initial containing block (usually the viewport). To extend the DIV dynamically to the bottom of the viewport, the following steps can be taken:

1. Set the position property of the DIV to absolute.
2. Set the left property to control the horizontal position of the DIV.
3. Set the top property to control the vertical position of the DIV.
4. Set the right property to control the width of the DIV.
5. Set the bottom property to 0 to extend the DIV to the bottom of the viewport.

Here is an example CSS code for achieving this effect:

.div-class {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
}

This CSS code positions the DIV at the top-left corner of the viewport and extends it to cover the entire viewport horizontally and vertically.

This technique is useful for creating full-page backgrounds or sticky footers that always stay at the bottom of the viewport regardless of the content height.

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