<style>
div {
    float:left;
    display: block;
    margin: 10px;
    padding:0px;
    width: 50px;
    height: 50px;
    background: green;
}
br {
    clear: left;
}
</style>
<!-- 
    This test checks that a null filter will not affect the rendering of the box at all.
    There should be 13 green boxes on screen. 
-->
<div style="-webkit-filter: blur(0)"></div>
<div style="-webkit-filter: brightness(1)"></div>
<div style="-webkit-filter: invert(0)"></div>
<div style="-webkit-filter: contrast(1)"></div>
