chromium/src/third_party/blink/web_tests/http/tests/devtools/changes/resources/after.css

.stays-the-same {
    font-size: 10px;
    font-family: sans-serif;
}

.was-modified {
    width: 0%;
}

.stays-the-same2 {
    font-size: 10px;
    font-family: Arial, Helvetica, sans-serif;
}

.was-added {
    color: #00F;
    color: #008;
    color: #000;
}

.stays-the-same3 {
    font-size: 15px;
    font-family: Arial, Helvetica, sans-serif;
}

.will-lose-properties {
    background: #000;
    background: #F00;
}