Transition color fade on hover?

I am trying to get this h3 to fade on hover. Can someone help me out?

HTML

<h3 class="clicker">test</h3>

CSS

.clicker {
    -moz-transition:color .2s ease-in;
    -o-transition:color .2s ease-in;
    -webkit-transition:color .2s ease-in;
    background:#f5f5f5;padding:20px;
}

.clicker:hover{
    background:#eee;
}

What do you want to fade? The background or color attribute?

Currently you're changing the background color, but telling it to transition the color property. You can use all to transition all properties.

.clicker { 
    -moz-transition: all .2s ease-in;
    -o-transition: all .2s ease-in;
    -webkit-transition: all .2s ease-in;
    transition: all .2s ease-in;
    background: #f5f5f5; 
    padding: 20px;
}

.clicker:hover { 
    background: #eee;
}

Otherwise just use transition: background .2s ease-in.

For having a trasition effect like a highlighter just to highlight the text and fade off the bg color, we used the following:

.field-error {
    color: #f44336;
    padding: 2px 5px;
    position: absolute;
    font-size: small;
    background-color: white;
}

.highlighter {
    animation: fadeoutBg 3s; /***Transition delay 3s fadeout is class***/
    -moz-animation: fadeoutBg 3s; /* Firefox */
    -webkit-animation: fadeoutBg 3s; /* Safari and Chrome */
    -o-animation: fadeoutBg 3s; /* Opera */
}

@keyframes fadeoutBg {
    from { background-color: lightgreen; } /** from color **/
    to { background-color: white; } /** to color **/
}

@-moz-keyframes fadeoutBg { /* Firefox */
    from { background-color: lightgreen; }
    to { background-color: white; }
}

@-webkit-keyframes fadeoutBg { /* Safari and Chrome */
    from { background-color: lightgreen; }
    to { background-color: white; }
}

@-o-keyframes fadeoutBg { /* Opera */
    from { background-color: lightgreen; }
    to { background-color: white; }
}

<div class="field-error highlighter">File name already exists.</div>