Turn an Entire DIV into a Clickable Link

Here we assign an absolute position to the inner <a> tag such that it occupies the entire DIV and we also set the z-index property to 10 to position the link above all the other elements in the DIV. This is the easiest approach and the semantic structure is maintained.

div.box {
   position: relative;
   width: 200px;
   height: 200px;
   background: #eee;
   color: #000;
   padding: 20px;
}

div.box:hover {
   cursor: hand;
   cursor: pointer;
   opacity: .9;
}

a.divLink {
   position: absolute;
   width: 100%;
   height: 100%;
   top: 0;
   left: 0;
   text-decoration: none;
   /* Makes sure the link doesn't get underlined */
   z-index: 10;
   /* raises anchor tag above everything else in div */
   background-color: white;
   /*workaround to make clickable in IE */
   opacity: 0;
   /*workaround to make clickable in IE */
   filter: alpha(opacity=0);
   /*workaround to make clickable in IE */
}