Css clipping, pie charts and hover - css

Question

from this:
http://www.kylejlarson.com/blog/2011/how-to-create-pie-charts-with-css3/
.pieContainer {
height: 100px;
}
.pieBackground {
background-color: grey;
position: absolute;
width: 100px;
height: 100px;
-moz-border-radius: 50px;
-webkit-border-radius: 50px;
-o-border-radius: 50px;
border-radius: 50px;
-moz-box-shadow: -1px 1px 3px #000;
-webkit-box-shadow: -1px 1px 3px #000;
-o-box-shadow: -1px 1px 3px #000;
box-shadow: -1px 1px 3px #000;
}
.pie {
position: absolute;
width: 100px;
height: 100px;
-moz-border-radius: 50px;
-webkit-border-radius: 50px;
-o-border-radius: 50px;
border-radius: 50px;
clip: rect(0px, 50px, 100px, 0px);
}
.hold {
position: absolute;
width: 100px;
height: 100px;
-moz-border-radius: 50px;
-webkit-border-radius: 50px;
-o-border-radius: 50px;
border-radius: 50px;
clip: rect(0px, 100px, 100px, 50px);
}
#pieSliceBlue{
-webkit-transform:rotate(0deg);
-moz-transform:rotate(0deg);
-o-transform:rotate(0deg);
transform:rotate(0deg);
}
#pieSliceBlue .pie {
background-color: #1b458b;
-webkit-transform:rotate(180deg);
-moz-transform:rotate(180deg);
-o-transform:rotate(180deg);
transform:rotate(180deg);
}
#pieSliceBlue2 {
-webkit-transform:rotate(180deg);
-moz-transform:rotate(180deg);
-o-transform:rotate(180deg);
transform:rotate(180deg);
}
#pieSliceBlue2 .pie {
background-color: #1b458b;
-webkit-transform:rotate(40deg);
-moz-transform:rotate(40deg);
-o-transform:rotate(40deg);
transform:rotate(40deg);
}
#pieSliceRed {
-webkit-transform:rotate(220deg);
-moz-transform:rotate(220deg);
-o-transform:rotate(220deg);
transform:rotate(220deg);
}
#pieSliceRed .pie {
background-color: #cc0000;
-webkit-transform:rotate(140deg);
-moz-transform:rotate(140deg);
-o-transform:rotate(140deg);
transform:rotate(140deg);
}
#pieSliceBlue .pie:hover{
background-color: yellow;
}
#pieSliceBlue2 .pie:hover{
background-color: yellow;
}
#pieSliceRed .pie:hover{
background-color: yellow;
}
<div class="pieContainer">
<div class="pieBackground"></div>
<div id="pieSliceBlue" class="hold"><div class="pie"></div></div>
<div id="pieSliceBlue2" class="hold"><div class="pie"></div></div>
<div id="pieSliceRed" class="hold"><div class="pie"></div></div>
</div>
Adding an :hover is ok for the slices blue2 and red but not for the first slice, where the hover works only on part of the slice.
http://jsfiddle.net/gvvsk/1/

Answer 1

The reason is that the pieSliceRed (the container for the .pie-div) is covering the pie-div contained in the pieSliceRed container, thus catching the hover event.
Since your solution most definately needs CSS3 support you can use pointer-events to bypass this behaviour. Try defining your css for the pieSliceRed this way instead:
#pieSliceRed {
pointer-events: none;
-webkit-transform:rotate(220deg);
-moz-transform:rotate(220deg);
-o-transform:rotate(220deg);
transform:rotate(220deg);
}
You can read more about the pointer-events here.