Since you are treating this as a table, where the elements stay in the same row, you can also wrap each row in a DIV with “display” set to “contents.” This forms an innocuous parent element that you use for hover, and then style the child elements. (display: contents is not yet supported in Edge, though.)
.table {
display: grid;
grid-template-columns: [col-start] auto [col-end];
grid-template-rows: [header-start] 50px [header-end row-start] auto [row-end];
grid-auto-rows: auto;
grid-auto-columns: auto;
grid-gap: 1px;
overflow: hidden;
background: gray;
}
.table .row, .table .heading{
padding: 10px;
position: relative;
}
.heading {
background: navy;
color: #fff;
grid-row: header;
}
.row span {
position: relative;
z-index: 2;
}
.rowWrapper{
display: contents;
}
.rowWrapper:hover > div{
background-color: orange;
}
<div class="table">
<div class="heading">Title 1</div>
<div class="heading">Title 2</div>
<div class="heading">Title 3</div>
<div class="heading">Title 4</div>
<div class="heading">Title 5</div>
<div class="rowWrapper">
<div class="row"><span>Row 1</span></div>
<div class="row"><span>Row 1</span></div>
<div class="row"><span>Row 1</span></div>
<div class="row"><span>Row 1</span></div>
<div class="row"><span>Row 1</span></div>
</div>
<div class="rowWrapper">
<div class="row"><span>Row 2</span></div>
<div class="row"><span>Row 2</span></div>
<div class="row"><span>Row 2</span></div>
<div class="row"><span>Row 2</span></div>
<div class="row"><span>Row 2</span></div>
</div>
<div class="rowWrapper">
<div class="row"><span>Row 3</span></div>
<div class="row"><span>Row 3</span></div>
<div class="row"><span>Row 3</span></div>
<div class="row"><span>Row 3</span></div>
<div class="row"><span>Row 3</span></div>
</div>
</div>