table.strike-able {
    border-collapse: collapse;
}

table.strike-able tr td {
    position: relative;
}

table.strike-able tr.strikeout td.strike-able:before {
    content: " ";
    position: absolute;
    top: 50%;
    left: 0;
    border-bottom: 2px solid gray;
    width: 100%;
}

table.strike-able tr.strikeout td:not(.skip):before {
    content: " ";
    position: absolute;
    top: 50%;
    left: 0;
    border-bottom: 2px solid rgba(0, 0, 0, .2);
    width: 100%;
}