table {
border-collapse: separate;
border-spacing: 0;
border-top: 1px solid grey;
}
td, th {
margin: 0;
border: 1px solid grey;
white-space: nowrap;
border-top-width: 0px;
}
div {
width: 500px;
overflow-x: scroll;
margin-left: 5em;
overflow-y: visible;
padding: 0;
}
.headcol {
position: absolute;
width: 5em;
left: 0;
top: auto;
border-top-width: 1px;
/*only relevant for first row*/
margin-top: -1px;
/*compensate for top border*/
}
.headcol:before {
content: 'Row ';
}
.long {
background: yellow;
letter-spacing: 1em;
}