Hi,
Please use Google Chrome browser to test your page. Internally EO.Pdf uses WebKit rendering engine to render HTML. Writting mode is supported by WebKit but with different CSS property name value. For example, you can try the following HTML and you should see it renders vertical text:
Code: HTML/ASPX
<table>
<tr>
<td>
<p style="-webkit-writing-mode: vertical-rl">
Hello Word
</p>
</td>
</tr>
</table>
Note that:
1. The property name/value is different than what you would use in IE;
2. Writing mode does not work on td. So you need to add another element (in the above code the p element);
Here is an article about writing mode in different browsers that you might find helpful:
http://generatedcontent.org/post/45384206019/writing-modesHope this helps. Please feel free to let us know if you still have any more questions.
Thanks!