chromium/third_party/blink/perf_tests/layout/resources/floats.css

.container {
    display: none;
}

.float {
    float: left;
    width: 5px;
    height: 5px;
    border: 1px solid green;
}

.big {
    width: 10px;
}

.float-end {
    clear:left;
}