[Ghitulescu]

I decided to play a bit with transform: rotate (parameter) in a div.
Calibre displays it partially correct (at least the rotation is accepted), while no HW readers could do it.

So I completed the CSS with

.rotate {
  display:inline-block;
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
  -webkit-transform: rotate(270deg);
  -ms-transform: rotate(270deg);
  transform: rotate(270deg);
}

and used the

<div class="rotate">

in <TH>.

That's the result.

As you can see, the text is strangely grouped and split in many lines although the space given would have accommodated it in full.

Nevertheless, I'll abandon this as having no support in the normal HW eReaders. I'll try the SVG stuff next.

Thanks for attention.