html css implementation method to control div or table to be fixed at specified position

.bottomTable{    
background-color: rgb(249,249,249);    
z-index:99999999; position:fixed; bottombottom:0; left:0; width:100%; _position:absolute; /* for IE6 */  
/* _top: expression(document.body.scrollTop+document.body.clientHeight-this.offsetHeight);    */  
_top: expression(document.body.scrollTop+document.body.clientHeight-this.offsetHeight-6); /* for IE6 */  
overflow:visible;   
 }

1. z-index: Set the layer to be at the top level.

2. position:fixed; set positioning.

3. _top: expression(document.body.scrollTop+document.body.clientHeight-this.offsetHeight-6); Bind js through css to control the height of the layer from the top,

The control layer is at the bottom, and the specific values ​​should be adjusted accordingly according to needs.

4. document.body.scrollTop: body, the scrolling distance of the body label scroll bar, can be replaced by your other label objects (scroll bars exist).

5. document.body.clientHeight, the height of the body tag, can be replaced by your other tag objects.

6, -6, make corresponding changes according to the specific situation.

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