I am using HTML renderer 1.5.0.6 for wpf available on https://htmlrenderer.codeplex.com/ The problem is Arabic/Persian characters is shown separated, for example this code:
<!doctype html>
<html dir="rtl">
<head>
<meta http-equiv="Content-Type" content="text/html; charset = utf8" />
</head>
<body>سلام</body>
</html>
is shown like: سلام