I don't know how hard it would be to make the header rows in BlockingDeque presented like the ones in e.g. Deque. Deque uses striped thead, which gets the #DDD background from the stylesheet. And having <thead>s is probably itself an accessibility feature.
table.striped > thead {
background-color: #DDD;
border: 1px solid black;
}
we could brute force the same background color or try to convert these to
striped tables (but you probably tried that).
