#29846

I would recommend just to enclose your CSS style with HTML tags:

<html>
<head>
<style>
... your CSS code here ...
</style>
</head>
</html>

If it is a standalone CSS stylesheet, refer to it with <link> tag from a minimalistic HTML as above.

Pass the HTML to PD4ML in debug mode. PD4ML will dump to STDOUT all CSS syntax issues it detected.